AUREAL SEMICONDUCTOR INC
POS AM, 1999-04-26
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<PAGE>   1
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 26, 1999
 
                                                      REGISTRATION NO. 333-66867
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                         POST-EFFECTIVE AMENDMENT NO. 1
                                       TO
 
                                    FORM S-2
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
 
                           AUREAL SEMICONDUCTOR INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                                 <C>
                     DELAWARE                                           94-3117385
 (STATE OR OTHER JURISDICTION OF INCORPORATION OR          (I.R.S. EMPLOYER IDENTIFICATION NO.)
                   ORGANIZATION)
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                             4245 TECHNOLOGY DRIVE
                           FREMONT, CALIFORNIA 94538
                                 (510) 252-4245
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------
 
                                DAVID J. DOMEIER
                   VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
                           AUREAL SEMICONDUCTOR INC.
                             4245 TECHNOLOGY DRIVE
                           FREMONT, CALIFORNIA 94538
                                 (510) 252-4245
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------
 
                                   COPIES TO:
                            JAMES M. KOSHLAND, ESQ.
                              DAVID A. HUBB, ESQ.
                        GRAY CARY WARE & FREIDENRICH LLP
                              400 HAMILTON AVENUE
                        PALO ALTO, CALIFORNIA 94301-1825
                                 (650) 328-6561
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
  From time to time as described in the Prospectus after the effective date of
                          this Registration Statement.
 
    If any of the securities being registered on this Form to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended (the "Securities Act") check the following box.  [X]
 
    If the registrant elects to deliver its latest annual report to security
holders, or a complete and legal facsimile thereof, pursuant to Item 11(a) of
this Form, check the following box:  [ ]
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration number of the earlier effective
registration statement for the same offering.  [ ]
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the same
offering.  [ ]
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement for the same offering.  [ ]
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
check the following box.  [ ]
 
                        CALCULATION OF REGISTRATION FEE
 
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<S>                                   <C>                      <C>                  <C>                  <C>
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                                                                PROPOSED MAXIMUM     PROPOSED MAXIMUM
TITLE OF EACH CLASS OF                     AMOUNT TO BE          OFFERING PRICE     AGGREGATE OFFERING        AMOUNT OF
SECURITIES TO BE REGISTERED                 REGISTERED            PER SHARE(1)           PRICE(1)        REGISTRATION FEE(2)
- ----------------------------------------------------------------------------------------------------------------------------
 Common Stock ($0.01 par value).....   19,954,137 shares(3)          $0.525             $10,475,922            $2,912
 Common Stock ($0.01 par value).....   13,387,449 shares(4)          $0.525              7,028,411              1,954
     Total..........................     33,341,586 shares                              $17,504,333            $4,866
- ----------------------------------------------------------------------------------------------------------------------------
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Estimated solely for the purpose of computing the registration fee pursuant
    to Rule 457(c) of the Securities Act and based on the average of the closing
    bid and asked prices reported on the Over-the-Counter Electronic Bulletin
    Board on October 30, 1998.
(2) This Registration Statement also includes 3,960,000 shares that were
    previously registered on Registration Statement No. 333-39939 and for which
    the Registrant previously paid an aggregate filing fee of $3,283. In
    addition, this Registration Statement includes an additional 28,150,000
    shares that were previously registered on Registration Statement No.
    333-62083 and for which the Registrant previously paid an aggregate filing
    fee of $10,249.
(3) Represents additional shares of common stock issuable upon conversion of all
    outstanding shares of series C preferred stock as described in the
    Prospectus, assuming that such conversion is as of October 30, 1998.
(4) Represents additional shares of common stock issuable upon conversion of all
    outstanding shares of series A preferred stock as described in the
    Prospectus, assuming such conversion is as of October 30, 1998.
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON
SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SUCH SECTION 8(a), MAY
DETERMINE.
 
    PURSUANT TO RULE 429, THE PROSPECTUS FORMING A PART OF THIS REGISTRATION
STATEMENT ALSO RELATES TO THE REGISTRANT'S EARLIER REGISTRATION STATEMENTS ON
FORM S-2/A-2 (NO. 333-39939) AND S-2/A-1 (NO. 333-62083) AND UPDATES THE
INFORMATION CONTAINED THEREIN. SUCH REGISTRATION STATEMENTS RELATE TO, AMONG
OTHER THINGS, SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF SHARES OF THE
REGISTRANT'S SERIES A PREFERRED STOCK, SERIES B PREFERRED STOCK, SERIES C
PREFERRED STOCK, COMMON STOCK AND SHARES OF COMMON STOCK OF THE REGISTRANT
ISSUABLE UPON EXERCISE OF CERTAIN OUTSTANDING WARRANTS.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
The information in this prospectus is not complete and may be changed. These
securities may not be sold until the registration statement filed with the SEC
is effective. This prospectus is not an offer to sell these securities and it is
not soliciting an offer to buy these securities in any state where the offer or
sale is not permitted.
 
                  SUBJECT TO COMPLETION, DATED APRIL 26, 1999
 
                               65,451,586 Shares
 
                           Aureal Semiconductor Inc.
 
                                  Common Stock
 
                            ------------------------
 
     The selling stockholders of Aureal Semiconductor Inc. listed on page 12 may
offer and resell up to 65,451,586 shares of Aureal common stock under this
prospectus, for each of their own accounts. The number of shares the selling
stockholders may sell includes shares of common stock that currently are issued
and outstanding, as well as shares of common stock that they may receive if they
(1) convert their shares of series A preferred stock, series B preferred stock
or series C preferred stock or (2) exercise their warrants. We will not receive
any proceeds from such sales, but we will receive the exercise price of the
warrants if the warrants are exercised. We issued shares of our common stock and
shares of series A, series B, series C preferred stock and certain warrants in a
series of private transactions between March 1998 and June 1998 to the selling
stockholders.
 
     Our common stock is quoted on the Over-the-Counter Electronic Bulletin
Board under the symbol "AURL." The 65,451,586 shares of common stock being
offered by this prospectus represent approximately 53% of our total outstanding
equity securities. Registering such a large percentage of Aureal's total
outstanding securities may have an adverse effect on the market price for our
common stock.
 
     We have included disclosure of certain recent events. Please see page 15
for a description of these events.
 
                            ------------------------
 
     INVESTING IN THE COMMON STOCK INVOLVES A HIGH DEGREE OF RISK. PLEASE SEE
"RISK FACTORS" BEGINNING ON PAGE TWO.
 
                            ------------------------
 
     The shares have not been approved or disapproved by the SEC or any state
securities commission, nor have these organizations determined that this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.
 
                            ------------------------
 
The date of this Prospectus is              , 1999
<PAGE>   3
 
                               TABLE OF CONTENTS
 
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                                                              PAGE
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<S>                                                           <C>
ABOUT AUREAL................................................    1
RISK FACTORS................................................    2
WHERE YOU CAN FIND MORE INFORMATION.........................    8
FORWARD LOOKING INFORMATION.................................    9
USE OF PROCEEDS.............................................    9
SELLING STOCKHOLDERS........................................   10
PLAN OF DISTRIBUTION........................................   14
RECENT DEVELOPMENTS.........................................   15
LEGAL MATTERS...............................................   16
EXPERTS.....................................................   16
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<PAGE>   4
 
                                  ABOUT AUREAL
 
     Aureal Semiconductor Inc. is a producer of audio semiconductor products and
advanced audio technologies for the personal computer and consumer electronics
markets. We contract with independent silicon manufacturers, which in the
semiconductor industry are called foundries, for production of our semiconductor
products, and thus we do not fabricate our own semiconductor products. The
foundry that manufactures the majority of our semiconductor products is one of
the three largest foundries in the world that manufactures products exclusively
for other companies. Our objective is to be a leading provider of advanced
digital audio solutions for the personal computer and consumer electronics
markets.
 
     In May 1996, we acquired Crystal River Engineering, Inc., a leader in the
field of 3D audio technology. Crystal River Engineering is now our wholly-owned
subsidiary and offers hardware and software solutions optimized for 3D audio
presentation.
 
     We are headquartered in Fremont, California, in a leased 36,000 square foot
building. In January 1999, we leased an additional 8,000 square feet of office
space in the vicinity of our Fremont headquarters. We maintain additional office
space in Austin, Texas and Hong Kong. As of January 3, 1999, we employed 111
people. Of this total, 74 were engaged in engineering functions, 26 were in
sales and marketing activities, and 11 were engaged in administrative support.
 
     Aureal, Aureal 3D, A3D and the A3D logo are registered trademarks of Aureal
Semiconductor Inc. Other trademarks referred to in this Prospectus belong to
their respective owners.
 
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<PAGE>   5
 
                                  RISK FACTORS
 
     In addition to the other information in this prospectus or incorporated in
this prospectus by reference, you should consider carefully the following
factors in evaluating Aureal and our business before purchasing the common stock
offered by this prospectus:
 
WE ARE OFFERING OUR CURRENT STOCKHOLDERS SUBSCRIPTION RIGHTS FOR OUR COMMON
STOCK
 
     We are offering holders of our common stock on the right to subscribe for
and purchase up to an aggregate 33,333,333 shares of our common stock at $0.60
per share. Every stockholder that exercises his subscription rights may also
elect to purchase shares that other stockholders have elected not to acquire. In
the event that all 33,333,333 shares are not subscribed for by our stockholders,
Oaktree and TCW, or any combination thereof, have agreed to purchase all
remaining shares. If holders of our common stock on the record date elect not to
subscribe to the rights offering, their percentage ownership of Aureal will be
immediately and substantially diluted by the rights offering. In addition,
holders who acquired our stock after the record date and hence are not able to
participate in the rights offering, will experience immediate and substantial
dilution of their percentage ownership of Aureal.
 
IF WE ANNOUNCE AND EFFECT A ONE-FOR-FIFTEEN REVERSE STOCK SPLIT, THE MARKET
PRICE OF OUR COMMON STOCK MAY DECLINE
 
     Our stock price may decline because we have announced our intentions to
effect a one-for-fifteen reverse stock split. Many companies that have announced
and then effected reverse stock splits have seen their stock price fall, both
before and after the reverse split is effected. On March 18, 1999, a special
committee of disinterested directors approved a one-for-fifteen reverse split in
our common stock. While a reverse stock split does not in any way affect the
value of, or your investment in, Aureal, the markets may react negatively to it
which will cause our stock price to decline further. We cannot assure you that,
as a result of the reverse stock split, our stock price will not decline to a
price that is less than fifteen times the price of our stock prior to the
reverse stock split.
 
WE HAVE SUSTAINED LOSSES IN THE PAST AND WE EXPECT TO SUSTAIN LOSSES IN THE
FUTURE
 
     We emerged from bankruptcy in December 1994. Since that time, we have
recorded an accumulated deficit of $173 million as of January 3, 1999, the end
of our fiscal 1998. This deficit is comprised of $157 million of incurred losses
and $16 million of accretion and dividends on our preferred stock. We generated
the majority of our revenues in 1997 and 1996 through technology licensing
transactions. The majority of our revenues in 1998 came from the sale of
advanced audio products. We expect that the majority of our future revenues will
be derived from the sale of advanced audio products. However, we will not be
profitable unless we sell significant volumes of our advanced audio products in
the future.
 
A DIRECTOR OF AUREAL HAS VOTING CONTROL OVER A SUBSTANTIAL AMOUNT OF OUR STOCK
AND MAY, THEREFORE, INFLUENCE OUR AFFAIRS
 
     As of March 22, 1999, Richard Masson, a director of Aureal, is deemed to
have voting control over approximately 59% of our common stock as a result of
his affiliations with Oaktree and TCW. As a result of the amount of our stock
deemed to be under the
 
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<PAGE>   6
 
stockholder voting control of Mr. Masson, Mr. Masson may directly and indirectly
influence the affairs of Aureal requiring stockholders' approval. Oaktree and
TCW also own 100% of the outstanding shares of our series B preferred stock,
which, upon the closing of our rights offering, will convert into approximately
20.5 million shares of our common stock. In addition, we have agreed to issue an
additional 26.2 million shares of our common stock to Oaktree and TCW upon their
conversion of our series B preferred stock on the closing of the rights
offering. In connection with the rights offering, Oaktree and TCW have the right
to subscribe for an aggregate of 19.7 million shares of our common stock.
Accordingly, Mr. Masson can be deemed to be, and after the rights offering will
be able to, control all matters requiring approval by our stockholders,
including the election of directors and the approval of mergers or other
business combinations.
 
INVESTORS MAY FIND IT DIFFICULT TO TRADE OUR COMMON STOCK ON THE
OVER-THE-COUNTER ELECTRONIC BULLETIN BOARD
 
     Our common stock trades only on the Over-the-Counter Electronic Bulletin
Board. We currently do not meet the requirements for listing on the Nasdaq
National Market or any national stock exchange. However, we believe that our
common stock will qualify for listing on the Nasdaq National Market after we
effect a one-for-fifteen reverse stock split. Because our common stock trades on
the Bulletin Board, an investor may find it very difficult to sell or to obtain
accurate quotations as to the market value of our common stock. Furthermore,
because our common stock is not listed on the Nasdaq National Market, trading in
our common stock is also subject to certain rules promulgated by the SEC under
the Securities Exchange Act of 1934. These rules require additional disclosure
by broker-dealers in connection with any trades involving a stock defined as a
penny stock. Generally, a penny stock is any non-Nasdaq National Market listed
equity security that has a market price of less than $5.00 per share, subject to
certain exceptions. Our common stock meets the definition of a penny stock. The
additional burdens imposed upon broker-dealers by such requirements may
discourage broker-dealers from affecting transactions in our common stock and
may limit the ability of purchasers of our common stock to resell our common
stock in the secondary market.
 
WE EXPECT THE AVERAGE SELLING PRICE OF OUR PRODUCTS TO DECREASE WHICH MAY REDUCE
GROSS MARGINS AND REVENUES
 
     Product prices in the audio technology industry generally decrease over the
life of a particular product. The willingness of prospective customers to design
our products into their products depends to a significant extent upon our
ability to price our products at levels that are cost-effective for these
customers. As the markets for our products mature and competition increases, we
anticipate that prices for our products will decline over time. If we are unable
to reduce our costs sufficiently to offset declines in our product prices, or if
we are unable to introduce new, higher performance products with higher product
prices, our gross margins and revenues will decline.
 
WE DEPEND ON A CREDIT FACILITY FROM TRANSAMERICA AND GOLDMAN SACHS TO FUND OUR
BUSINESS OPERATIONS
 
     Because we have not been profitable to date, we have had to fund our losses
through a combination of equity and debt financings. In June 1998, we entered
into a credit facility with the Technology Finance Division of Transamerica
Business Credit Corporation and
 
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<PAGE>   7
 
Goldman Sachs Credit Partners LP. This credit facility provides for an aggregate
maximum borrowing of $40 million. The interest rate on the credit facility is
generally the prime rate plus 3% to 5%. Accordingly, while the credit facility
provides us with needed working capital, the high cost of servicing any
borrowing under it could negatively affect our liquidity. In addition, the
credit facility may not be sufficient to meet our working capital requirements.
In the event we must secure capital in addition to the line of credit and the
proceeds we receive from this rights offering, there can be no assurance that
such capital will be available on acceptable terms or at all. Our inability to
secure such potential future financing, if necessary, would materially adversely
affect our business, financial condition and results of operations.
 
TO COMPETE EFFECTIVELY IN THE AUDIO TECHNOLOGY MARKET, WE NEED TO DEVELOP NEW
AUDIO TECHNOLOGIES THAT ARE WIDELY ACCEPTED BY OUR CUSTOMERS
 
     Our success depends on our ability to develop and market new audio
technologies aimed at advancing the level of audio quality in personal computers
and consumer electronics devices. To be successful, we must timely develop new
products that we can sell at competitive prices to our customers who will design
them into their products. In order for our customers to design our advanced
audio products into their personal computers and consumer electronic products,
we must:
 
     - anticipate market trends;
 
     - anticipate the performance and functionality requirements of our current
       and potential customers;
 
     - develop and produce products that meet the timing and pricing
       requirements of our current and potential customers; and
 
     - produce products that can be available in a timely manner consistent with
       our current and potential customers' development and production
       schedules.
 
     We are expanding our business model to provide for an increased number of
audio-related products, including audio cards and audio communications
combination cards. We may require additional working capital funds for this
expansion to provide for incremental inventory and broader marketing programs. A
number of factors may limit the success of our expansion, and each could
negatively impact our business and results of operations. These factors include:
 
     - the failure of the market for advanced audio products to grow;
 
     - reduced demand for our products as a result of increased competition in
       this market;
 
     - unforeseen technological change; and
 
     - our potential failure to introduce new versions of products that our
       customers and the market accept.
 
     A failure to develop new audio technologies that will be accepted by our
customers could materially adversely affect our ability to generate revenues.
 
                                        4
<PAGE>   8
 
NEW GENERATIONS OF MICROPROCESSORS AND OTHER NEW TECHNOLOGIES MAY DECREASE
DEMAND FOR OUR PRODUCTS
 
     We also face the risk that new generations of microprocessors that are
capable of performing the function of advanced audio products will greatly
reduce demand for our products. Each successive generation of microprocessors
has provided increased performance, which could, in the future, result in a
microprocessor capable of performing advanced audio functions to an extent that
diminishes or eliminates the need or preference for our products. In addition,
each new generation of technology, including digital audio technology, generally
requires increased processing power. The increased capabilities of
microprocessors in the future may lower demand for our products which will
materially adversely affect our business, financial condition and results of
operations.
 
INTENSE COMPETITION IN THE MARKET FOR AUDIO PRODUCTS AND ADVANCED AUDIO
TECHNOLOGIES COULD PREVENT AUREAL FROM INCREASING REVENUE AND PREVENT AUREAL
FROM ACHIEVING PROFITABILITY
 
     The markets for audio products and advanced audio technologies are
intensely competitive and are characterized by evolving industry standards that
result in:
 
     - short product life cycles;
 
     - significant pressure to improve price and performance; and
 
     - frequent new product introductions.
 
     We expect competition to increase from existing competitors and from other
companies that may enter the markets for advanced audio products with devices
that may be less costly or provide higher performance or additional features
than the products we currently offer. However, we are unable to predict the
timing and nature of any such competitive product offerings. In addition, we
anticipate that we will compete for the development of new technologies and for
the sale of semiconductor products with a number of companies who have more
extensive resources, including financial, manufacturing, technical, marketing
and distribution. Furthermore, some of these competitors have greater
intellectual property rights, broader product lines and longer-standing
relationships with their customers than we do. In addition to our established
competitors, we may also face competition from a number of emerging companies.
To remain competitive, we believe we must, among other things, invest
significant resources in developing new products and enhancing our current
products and maintaining customer satisfaction. If we fail to do so, our
products will not compete favorably with those of our competitors and our
revenue could be materially adversely affected.
 
WE MAY NOT HAVE AN ADEQUATE SUPPLY OF OUR PRODUCTS BECAUSE WE DEPEND ON
FOUNDRIES TO PRODUCE OUR PRODUCTS AND OUR PRODUCTS ARE DIFFICULT TO MANUFACTURE
 
     We do not manufacture our own products, and we depend on outside
manufacturing resources for production of all of our products. Currently, we
utilize one foreign semiconductor foundry for production of the majority of our
existing products. The foundry has indicated to us that it has the manufacturing
availability to provide for our planned levels of production of each of our
products for the next 12 months; however, our production relationship with the
foundry is based only upon purchase orders. Consequently, the foundry may not
continue to adequately provide manufacturing capacity to us for our
 
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<PAGE>   9
 
current level of production or any potential increases in our production levels.
In the event that the foundry ceases to manufacture our products, we would have
to contract with alternative foundries. However, we may not be able to timely
contract with alternative foundries or to contract with them at all. Such a
situation could materially adversely affect our ability to sell products to our
customers, which in turn would hurt our financial condition and results of
operations. The manufacture of semiconductor products is a highly complex and
precise process. Minute levels of contaminants in the manufacturing environment,
defects in the masks used to print circuits on wafers, difficulties in the
fabrication process and other factors can cause a substantial percentage of
wafers to be rejected or a significant number of die on each wafer not to
function. Many of these problems are difficult to diagnose and potentially
time-consuming or expensive to remedy. The foundries that we employ may, in the
future, experience irregularities or adverse yield fluctuations in the
manufacturing processes of our products. In such event, our business, financial
condition and results of operations may be materially adversely affected.
 
OUR CHARTER DOCUMENTS AND DELAWARE LAW MAY INHIBIT A TAKEOVER OF AUREAL
 
     Provisions in our amended and restated certificate of incorporation and
bylaws may have the effect of delaying or preventing a change of control or
changes in our management. These provisions include, among others:
 
     - the division of the board of directors into three separate classes;
 
     - the right of the board to elect the director to fill a space created by
       the expansion of the board;
 
     - the ability of the board to alter our bylaws; and
 
     - the requirement that at least 10% of the outstanding shares are needed to
       call a special meeting of stockholders.
 
     Furthermore, because we are incorporated in Delaware, we are subject to the
provisions of section 203 of the Delaware General Corporation Law. These
provisions prohibit certain large stockholders, in particular those owning 15%
or more of the outstanding voting stock, from consummating a merger or
combination with a corporation unless (1) 66 2/3% of the shares of voting stock
not owned by this large stockholder approve the merger or combination or (2) the
board of directors approves the merger or combination or the transaction which
resulted in the large stockholder owning 15% or more of our outstanding voting
stock.
 
WE MAY NOT BE ABLE TO RETAIN OUR KEY ENGINEERING, MARKETING, SALES AND
MANAGEMENT PERSONNEL THAT WE NEED TO SUCCESSFULLY MANAGE OUR BUSINESS
 
     Our success depends to a significant extent upon the continued services of
key engineering, marketing, sales and management personnel. Our employees may
voluntarily terminate their employment with us at any time. We recognize the
value of the contributions of each of our employees, and we have developed
compensation programs, including stock programs open to all employees, designed
to retain our employees. However, competition for these employees is intense,
particularly in Silicon Valley, and the loss of the services of any one of these
employees could materially adversely affect our business, financial condition
and results of operations.
 
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<PAGE>   10
 
OUR PRODUCTS EMPLOY PROPRIETARY TECHNOLOGY AND THIS TECHNOLOGY MAY INFRINGE ON
TO INTELLECTUAL PROPERTY RIGHTS OF THIRD PARTIES
 
     Our ability to compete successfully will depend, in part, on our ability to
protect our proprietary technology. We rely on a combination of patents, trade
secrets, copyright and trademark laws, nondisclosure agreements and other
contractual provisions and technical measures to protect our proprietary rights.
Nevertheless, such measures may not be adequate or safeguard the proprietary
technology underlying our advanced audio products. In addition, employees,
consultants and others who participate in the development of our products may
breach their agreements with us regarding our intellectual property, and we may
not have adequate remedies for any such breach. We also realize that our
proprietary information and trade secrets may become known through other means
not currently foreseen by us. Moreover, notwithstanding our efforts to protect
our intellectual property, our competitors may be able to develop products that
are equal or superior to our products without infringing on any of our
intellectual property rights. In addition, we may not be able to effectively
protect our intellectual property rights in certain countries. Our failure to
protect our proprietary technology may materially adversely affect our financial
condition and results of operations. Although we do not believe that our
products infringe the proprietary rights of any third parties, third parties may
still assert infringement or invalidity claims, or claims for indemnification
resulting from infringement claims, against us. The assertion of these claims
could materially adversely affect our business, financial condition and results
of operations. In addition, irrespective of the validity or the successful
assertion of any claims, we could incur significant costs in defending against
these claims. In defending claims of alleged infringement, we could incur
significant expenses and waste resources that could have a material adverse
affect on our business, financial condition and results of operations.
 
WE ARE INVOLVED IN LAWSUITS WITH CREATIVE AND E-MU WHICH COULD NEGATIVELY IMPACT
OUR BUSINESS
 
     In February 1998, Creative Technology Ltd. and its subsidiary, E-MU
Systems, Inc., served us with a lawsuit for patent infringement that Creative
and E-MU filed in the U.S. District Court, Northern District of California. The
lawsuit asserts that our original Vortex product infringes on a patent that
describes a specific implementation for an electronic musical instrument
designed by E-MU. Creative and E-MU seek, among other things, a preliminary and
permanent injunction against alleged continuing acts of infringement by us and
an accounting of damages plus interest. In response, we filed a motion for
summary judgment. In August 1998, E-MU and Creative filed a motion for a
preliminary injunction with respect to our original Vortex and updated Vortex2
products. In October 1998, the court denied Creative's motion for preliminary
injunction. In addition, our motion for summary judgment was also denied. We
believe that the actions that Creative and E-MU filed are without merit, and we
are vigorously defending against these actions. In December 1998, we filed a
lawsuit alleging patent infringement against Creative and E-MU. Aureal believes
that Creative and E-MU have infringed on two of their patents, Patent No.
5,596,644 entitled "Method and Apparatus for Efficient Presentation of Hi-
Quality 3-Dimensional Audio" and Patent No. 5,802,180 entitled "Method and
Apparatus for Efficient Presentation of 3-Dimensional Audio Including Ambient
Effects." Additional litigation may be necessary to resolve the claims asserted
by Creative and E-MU and to resolve our claims against Creative and E-MU and any
other claims asserted in the future to defend against claims of infringement or
invalidity or to enforce and protect our intellectual property rights. We cannot
assure you that we will prevail in any litigation with
 
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<PAGE>   11
 
either of them. Also, any litigation, whether or not determined in our favor or
settled by us, would be costly and would divert the efforts and attention of our
management and technical personnel from normal business operations; this could
materially adversely affect our business, financial condition and results of
operations. Adverse determinations in litigation could result in the loss of our
proprietary rights, subject us to significant liabilities, require us to seek
licenses from third parties or prevent us from producing certain core products.
Any of these results could have a material adverse affect on our business,
financial condition and results of operations.
 
THE FAILURE OF OUR KEY SUPPLIERS AND CUSTOMERS TO BE YEAR 2000 COMPLIANT COULD
NEGATIVELY IMPACT OUR BUSINESS
 
     We use a number of computer software programs and operating systems in our
internal operations, including applications used in financial business systems
and various administration functions. To the extent that these software
applications contain source code that is unable to appropriately interpret the
upcoming calendar year "2000," some level of modification or even possible
replacement of such source code or applications could be necessary. Given the
current information, we currently do not anticipate that such year 2000 costs
will have a material impact upon us. We have requested and obtained information
regarding year 2000 compliance from suppliers and providers of all of our
mission critical software systems. Based on the information we currently have,
all mission critical systems appear to be year 2000 compliant. We are currently
contacting major vendors and customers to obtain year 2000 compliance
certificates. The failure of any of our key suppliers or customers to be year
2000 compliant could have a material adverse effect on our business, financial
condition and results of operations.
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
     We file annual, quarterly and special reports, proxy statements and other
information with the SEC. You may read and copy any document we file at the
public reference facilities of the SEC in Washington, D.C., Chicago, Illinois
and New York, New York. Please call the SEC at 1-800-SEC-0330 for further
information on the public reference rooms. Our SEC filings are also available to
the public from the SEC's web site at http:\\www.sec.gov.
 
     The SEC allows us to "incorporate by reference" the information we have
filed with them, which means that we can disclose important information to you
by referring you to those documents. The information incorporated by reference
is considered to be part of this prospectus. We incorporate by reference the
documents listed below. This prospectus is part of a registration statement we
filed with the SEC (Registration Statement No. 333-66867).
 
          (1) The Company's Annual Report on Form 10-K/A for the fiscal year
     ended January 3, 1999.
 
          (2) The Company's Definitive Proxy filed on April 16, 1999.
 
          (3) The Company's Registration Statement on Form S-3/A-1 (Registration
     No. 333-75631) filed on April 16, 1999.
 
                                        8
<PAGE>   12
 
     You may request a copy of these filings, at no cost, by writing or
telephoning us at the following address:
 
                              Stockholder Services
                           Aureal Semiconductor Inc.
                             4245 Technology Drive
                           Fremont, California 94538
                                 (510) 252-4245
 
     In addition, we will deliver a copy of our (1) Annual Report on Form
10-K/A-1 for the fiscal year ended January 3, 1999 and (2) most recent Quarterly
Report on Form 10-Q, without charge, to each person receiving a copy of this
prospectus.
 
                          FORWARD LOOKING INFORMATION
 
     This prospectus, including the information incorporated by reference,
contains forward-looking statements made pursuant to the safe harbor provisions
of the Private Securities Litigation Reform Act of 1995. Actual results could
differ materially from those projected in the forward-looking statements as a
result of the risk factors set forth on page 2 and others detailed from time to
time in our periodic reports filed with the SEC.
 
                                USE OF PROCEEDS
 
     We will not receive any proceeds from sale of common stock by any of the
selling stockholders. The exercise price of the outstanding warrants range from
$2.16 to $2.50. If all of the warrants are exercised, we will receive proceeds
of approximately $3.3 million, which we will use to repay outstanding
indebtedness and for general corporate purposes.
 
                                        9
<PAGE>   13
 
                              SELLING STOCKHOLDERS
 
     The selling stockholders currently hold unregistered shares of our common
stock or will hold shares of common stock that are issuable upon conversion of
the series A preferred stock, series B preferred stock and series C preferred
stock and exercise of certain warrants, if any. Following is a brief summary of
the terms of the series A, series B and series preferred stock and the warrants.
 
SERIES A PREFERRED STOCK AND WARRANTS TO PURCHASE COMMON STOCK.
 
     We sold 500 shares of series A preferred stock to institutional investors
in March 1998. The series A preferred stock may convert into shares of common
stock at a price equal to the lower of $2.50 per share or a percentage, not less
than 80%, of the lowest average closing bid price of our common stock for any
five trading days during the 30 trading days immediately preceding the date of
conversion. Holders of series A preferred stock may convert their shares at any
time. However, holders currently may not convert more than 15% of the originally
issued shares of series A preferred stock in any month using the five
trading-day formula. All shares of series A preferred stock may convert into
shares of common stock using the five trading-day formula beginning in January
1999. In addition, we can redeem the series A preferred stock at a per share
price equal to a percentage of the purchase price, ranging from 115% to 130% of
the purchase price, depending on the date of redemption. Shares of series A
preferred stock have no voting rights.
 
     In February 1998, we issued 70,000 shares of common stock and warrants to
purchase 140,000 shares of common stock to certain persons as compensation for
assisting us in the sale of shares of series A preferred stock. The warrants
have an exercise price of $2.50 per share.
 
SERIES B PREFERRED STOCK.
 
     In June 1998, we issued 39,375 shares of series B preferred stock to TCW
Special Credits and DDJ Management, LLC with a conversion value of $39.75
million in exchange for the cancellation of an aggregate of $31.5 million that
we owed them. The series B preferred stock converts into common stock at a price
of $2.50 per share. Holders of series B preferred stock are entitled to the
payment of dividends, either in cash or additional shares of series B preferred
stock, at a rate of 8% per year. The holders of series B preferred stock may
vote the equivalent number of shares of our common stock as they would hold if
they converted their shares immediately prior to the record date for such vote.
In addition, we can redeem the series B preferred stock at face value, plus
accrued but unpaid dividends, at any time. We have agreed to issue an additional
26.2 million shares of common stock to holders of our series B preferred stock
who convert their shares into common stock upon the closing of our rights
offering, pursuant to which we will offer for sale $20 million of our common
stock, at a price of $0.60 per share, to our stockholders at the close of
business on April 22, 1999. The rights offering is scheduled to close on May 21,
1999. These additional 26.1 million shares will not be registered but we will
grant standard demand and piggyback registration rights to the holders of these
shares. We understand that TCW and Oaktree, holders of all of our series B
preferred, have agreed to convert their shares of series B preferred stock into
20.5 million shares of common stock upon the closing of the rights offering.
 
                                       10
<PAGE>   14
 
SERIES C PREFERRED STOCK.
 
     We sold 600 shares of series C preferred stock to institutional investors
in June 1998. The series C preferred stock may convert into shares of common
stock at a price equal to the lower of $2.50 per share or a percentage, not less
than 80%, of the lowest average closing bid price of our common stock for any 5
trading days during the 30 trading days immediately preceding the date of
conversion. Holders of series C preferred stock may convert their shares at any
time. However, holders currently may not convert more than 15% of the originally
issued shares of series C preferred stock in any month using the five
trading-day formula. All shares of series C preferred stock may convert into
shares of common stock using the five trading-day formula beginning in April
1999. In addition, we can redeem the series C preferred stock at a per share
price equal to a percentage of the purchase price, ranging from 115% to 130% of
the purchase price, depending on the redemption date. Shares of series C
preferred stock have no voting rights.
 
WARRANTS TO PURCHASE COMMON STOCK.
 
     When we entered into a $40 million line of credit with Technology Finance
Division of Transamerica Business Credit Corporation and Goldman Sachs Credit
Partners LP, we issued warrants to purchase 1,350,000 shares of common stock to
Transamerica and Goldman Sachs. Transamerica and Goldman Sachs may exercise
these warrants at any time during their five year term. The exercise price of
these warrants is $2.156 per share.
 
NUMBER OF SHARES OF COMMON STOCK THAT WE MAY ISSUE
 
     Assuming full conversion of the series A, series B and series C preferred
stock and exercise of the warrants on March 22, 1999, we would issue
approximately 44.7 million shares of our common stock to the selling
stockholders. These approximately 44.7 million shares would represent 36% of our
outstanding equity securities.
 
SELLING STOCKHOLDER TABLE.
 
     The table below lists, in each case as of March 22, 1999:
 
     1. the name of each selling stockholder;
 
     2. the number of shares each selling stockholder beneficially owns;
 
     3. how many shares of common stock the selling stockholder may resell under
        this prospectus; and
 
     4. assuming each selling stockholder sells all the shares listed next to
        its name, how many shares of common stock each selling stockholder will
        beneficially own after completion of the offering.
 
     Beneficial ownership is determined in accordance with rules promulgated by
the SEC, and the information is not necessarily indicative of beneficial
ownership for any other purpose. This table is based upon information supplied
to us by officers, directors and principal stockholders. Except as otherwise
indicated, Aureal believes that the persons or entities named in the table have
sole voting and investment power with respect to all shares of the common stock
shown as beneficially owned by them, subject to community property laws where
applicable.
 
                                       11
<PAGE>   15
 
     Because of certain contractual obligations that we made to the holders of
series A and series C preferred stock, we are registering 150% of the shares of
common stock that would have been issued if the series A and C preferred
stockholders had converted their preferred stock on March 22, 1999. However, the
number of shares listed in this table is based on the number of shares into
which each selling stockholder's preferred stock or warrants could convert as of
March 22, 1999. As a result, these numbers could change from time to time
depending on the conversion price in effect at the time a selling stockholder
converts its shares of preferred stock. In order to prevent dilution to the
selling stockholders, these numbers may also change because of (1) the floating
rate conversion price mechanism, (2) stock splits, (3) stock dividends or (4)
similar events involving our common stock.
 
     We may amend or supplement this prospectus from time to time in the future
to update or change this list of selling stockholders and shares which may be
resold.
 
<TABLE>
<CAPTION>
                                            BENEFICIAL OWNERSHIP                   BENEFICIAL OWNERSHIP
                                           PRIOR TO THE OFFERING    SHARES TO BE    AFTER THE OFFERING
                                           ----------------------   SOLD IN THE    --------------------
           SELLING STOCKHOLDER               SHARES      PERCENT      OFFERING       SHARES     PERCENT
           -------------------             -----------   --------   ------------   ----------   -------
<S>                                        <C>           <C>        <C>            <C>          <C>
Oaktree Capital Management, LLC(1).......  27,968,557      32.1%     18,246,148     9,722,409    11.2%
  333 South Grand Street,
  28th Floor
  Los Angeles, Ca 90071
The TCW Group, Inc., and its
  affiliates(2)..........................  33,988,793      39.9%     14,380,430    19,608,363    23.0%
  11100 Santa Monica Blvd.,
  Suite 2000
  Los Angeles, CA 90025
DDJ Capital Management, LLC..............   3,228,860       3.8%      2,548,860       680,000       *
  41 Linden Street, Suite S-4
  Wellesley, MA 02482-7910
EP Opportunity Fund, LLC.................   1,926,797       2.3%      1,926,797            --       *
Eisenberg Partners, L.L.C
  77 Wacker Drive, 46th Floor
  Chicago, IL 60601
Queensway Financial Holding Limited......   1,374,443       1.6%      1,374,443            --       *
  90 Adelaide Street West, Suite 500
  Toronto, Ontario M6E3A2 Canada
Banque Franck SA.........................   1,034,598       1.2%      1,034,598            --       *
Faisal Finance SA
Colntrin
  84 Avenue Louis-Casal
  Geneva, Switzerland 1216
Cranshire Capital, L.P...................     515,011         *         515,011            --       *
  770 Frontage Road, Suite 134
  Northfield, IL 60093
LaRoque Trading Group, LLC...............   2,910,309       3.4%      2,910,309            --       *
  440 South LaSalle, Suite 701
  Chicago, IL 60605
Keyway Investments, Ltd..................   1,612,691       1.9%      1,612,691            --       *
Midland Walwyn Capital, Inc.
BCE Place
  181 Bay Street, Suite 500
  Toronto, Ontario, Canada M5J2V8
</TABLE>
 
                                       12
<PAGE>   16
 
<TABLE>
<CAPTION>
                                            BENEFICIAL OWNERSHIP                   BENEFICIAL OWNERSHIP
                                           PRIOR TO THE OFFERING    SHARES TO BE    AFTER THE OFFERING
                                           ----------------------   SOLD IN THE    --------------------
           SELLING STOCKHOLDER               SHARES      PERCENT      OFFERING       SHARES     PERCENT
           -------------------             -----------   --------   ------------   ----------   -------
<S>                                        <C>           <C>        <C>            <C>          <C>
Transamerica Business Credit
  Corporation............................     506,250         *         506,250            --       *
  15260 Ventura Blvd., Suite 1240
  Sherman Oaks, CA 91403
Goldman Sachs & Co.......................     843,750       1.0%        843,750            --       *
  One New York Plaza
  New York, NY 10004
Banque Edouard Constant SA...............      36,600         *          36,600            --       *
Kernco Trust S.A.
  P.O. Box 6432
  2, Rue Jargonant
  Geneva, Switzerland 1211
Lakeshore International, Ltd. ...........      94,842         *          94,842            --       *
EBF & Associates
  601 Carlson Parkway, Suite 200
  Minnetonka, MN 55305
Swartz Investments LLC...................      70,000         *          70,000            --       *
  1080 Holcomb Road
  200 Roswell Summit
  Suite 285
  Roswell, Georgia 30076
Eric S. Swartz(3)........................      34,792         *          34,792            --       *
Kendrick Family Partnership, LP(3).......      34,792         *          34,792            --       *
P. Bradford Hathorn(3)...................       3,500         *           3,500            --       *
Gerald David Harris(3)...................      10,324         *          10,324            --       *
Glenn R. Archer(3).......................       3,500         *           3,500            --       *
Carlton M. Johnson, Jr.(3)...............       2,500         *           2,500            --       *
Davis C. Holden(3).......................       2,000         *           2,000            --       *
Frank G. Mauro(3)........................      34,792         *          34,792            --       *
H. Nelson Logan(3).......................       1,000         *           1,000            --       *
Kelley E. Smith(3).......................       1,000         *           1,000            --       *
James David Mills(3).....................       1,000         *           1,000            --       *
Dwight B. Bronnum(4).....................         500         *             500            --       *
  8309 Dunwoody Avenue
  Atlanta, GA 30350
Robert L. Hopkins(4).....................         500         *             500            --       *
  8309 Dunwoody Avenue
  Atlanta, GA 30350
Enigma Investments, Ltd.(4)..............       5,600         *           5,600            --       *
  P.O. Box 1894
  Elizabethan Square
  George Town
  Grand Cayman
Charles B. Krusen(4).....................       4,200         *           4,200            --       *
  465 Park Avenue
  New York, NY 10022
                                                                     ----------
    Total................................                            46,240,729
                                                                     ==========
</TABLE>
 
- -------------------------
 *  Less than one percent
 
(1) Oaktree acts as an investment manager for certain funds and accounts,
    including certain funds affiliated with TCW, and in that capacity, may be
    deemed to beneficially
 
                                       13
<PAGE>   17
 
    own securities held by those funds and accounts. Includes 1,075,000 shares
    of common stock that may be issued upon exercise of warrants issued to
    Oaktree, 2,396,738 shares of common stock acquirable upon conversion of
    5,969 shares of series B preferred stock and 2,553,202 shares of common
    stock acquirable upon conversion of 100 shares of series C preferred stock.
    Series B preferred stock have voting rights on an "as converted" basis.
    Oaktree expressly disclaims beneficial ownership on the shares referenced
    herein. The series C preferred stock have no voting rights.
 
(2) TCW acts as an investment manager of certain funds and accounts, and in that
    capacity, may be deemed to beneficially own securities held by those funds
    and accounts. Includes 2,950,000 shares of common stock that may be issued
    upon exercise of warrants issued to TCW and 4,380,430 shares of common stock
    acquirable upon conversion of 35,816 shares of series B preferred stock. All
    of these securities are held by limited partnerships, trusts and third party
    separate accounts for which TCW acts as general partner, trustee and
    investment advisor respectively. TCW and its affiliates expressly disclaim
    beneficial ownership of these securities. To the extent that Mr. Masson, as
    an authorized representative of Oaktree and TCW, participates in the process
    to vote or dispose of any Oaktree or TCW controlled shares, he may be deemed
    to be the beneficial owner of those shares. Mr. Masson disclaims beneficial
    ownership of those shares.
 
(3) The address for this selling stockholder is c/o Swartz Investment LLC, 1080
    Holcomb Road, 200 Roswell Summit, Suite 285, Roswell, Georgia 30076. This
    selling stockholder is an employee of, or otherwise affiliated with, Swartz
    Investment LLC. Aureal issued this selling stockholder a warrant as
    compensation for services that this selling stockholder rendered for Aureal.
    The shares of common stock that this selling stockholder may resell are
    issuable upon exercise of the warrant.
 
(4) This selling stockholder is not affiliated with, or employed by, Swartz
    Investment LLC, but performed services on behalf of Swartz in conjunction
    with the sale of the series A preferred stock. Aureal issued this selling
    stockholder a warrant as compensation for services that this selling
    stockholder rendered for Aureal. The shares of common stock that this
    selling stockholder may resell are issuable upon exercise of the warrant.
 
                              PLAN OF DISTRIBUTION
 
     The selling stockholders may sell their shares of common stock in one or
more transactions, which may involve block transactions,
 
     1. on the Over-the-Counter Electronic Bulletin Board;
 
     2. on such other markets on which our common stock may from time to time be
trading;
 
     3. in privately-negotiated transactions;
 
     4. through the writing of options on the shares of common stock, short
sales or any combination the two.
 
     The selling stockholders may sell at market prices at the time of sale, at
prices related to the market price or at negotiated prices. It is possible that
a selling stockholder will
 
                                       14
<PAGE>   18
 
attempt to sell shares of common stock in block transactions to market makers or
other purchasers at a price per share which may be below the then current market
price. Some or all of the shares of common stock offered by this prospectus may
not be issued to, or sold by, the selling stockholders.
 
     Aureal has agreed to indemnify the selling stockholders against liabilities
they may incur because of an untrue or alleged untrue statement of a material
fact contained in this prospectus or the omission or alleged omission to state
in the prospectus a material fact required to be in the prospectus, or necessary
to make the statements in this prospectus not misleading. However, we shall not
be required to indemnify any selling stockholder for liabilities that we incur
based on our reliance on written information that the selling stockholder has
furnished to us expressly for use in this prospectus. Likewise, the selling
stockholders have agreed to indemnify Aureal against liabilities that we incur
as a result of any statement or omission made in this prospectus based on
written information that the selling stockholder has provided us against
liabilities. No selling stockholder, however, shall be liable to us for amounts
in excess of the net proceeds it receives from the sale of its shares pursuant
to this prospectus.
 
     The selling stockholders and any brokers, dealers or agents, upon effecting
the sale of any of the shares of common stock, may be deemed to be
"underwriters" as that term is defined under the Securities Act or the Exchange
Act, or the rules and regulations thereunder. In addition, the selling
stockholders and any other persons participating in the sale or distribution of
the shares of common stock will be subject to applicable provisions of the
Exchange Act and the rules and regulations thereunder. These provisions may
limit the timing of purchases and sales of any of common stock by the selling
stockholders or any other such person. The foregoing may affect the
marketability of the shares of common stock.
 
     We have agreed to use our best efforts to keep the Registration Statement,
of which this prospectus constitutes a part, effective until the earlier of (1)
the date on which the selling stockholders can sell all of the shares of common
stock pursuant to Rule 144 of the Securities Act or (2) when the selling
stockholders have resold all of the shares of their registered common stock
pursuant to Rule 144 or an effective registration statement.
 
                              RECENT DEVELOPMENTS
 
     In March 1999, we reached, and our board of directors approved, an
agreement with our largest stockholders, those being certain funds and accounts
managed by Oaktree Capital Management, LLC, referred to as Oaktree, and by TCW
Special Credits, referred to as TCW, under which we will offer for sale $20
million of our common stock, at a price of $0.60 per share, under a subscription
rights offering. Stockholders of our common stock on the date of record will be
offered, on a pro-rata basis, the opportunity to purchase new shares of our
common stock. Oaktree and TCW, or any combination thereof, have agreed to
purchase any remaining unsubscribed shares of this offering, up to a maximum
amount of $20 million. In addition, we have also agreed to issue an additional
26.2 million shares of common stock to holders of our series B preferred stock
who convert those shares into common stock upon the closing of the rights
offering. These additional 26.2 million shares will not be registered but we
will grant standard demand and piggyback rights to the holders of those shares.
We understand that TCW and Oaktree, holders of all of our series B preferred
stock, intend to convert their shares of series B preferred stock into 20.5
million shares of common stock upon the closing of the rights offering. Oaktree
 
                                       15
<PAGE>   19
 
recently purchased the majority of the preferred stock previously held by DDJ.
These actions will effectively eliminate the majority of our preferred stock and
convert it to common stock. Subject to stockholder approval our board of
directors has also approved a one for fifteen reverse stock split, an increase
in the number of authorized shares reserved under our option plan and a change
in our name from Aureal Semiconductor Inc. to Aureal Inc.
 
                                 LEGAL MATTERS
 
     Gray Cary Ware & Freidenrich LLP will issue an opinion about the legality
of the shares for us.
 
                                    EXPERTS
 
     Arthur Andersen LLP, independent public accountants, audited our
consolidated financial statements incorporated by reference in this prospectus
and elsewhere in the registration statement to the extent and for the periods
indicated in their report. These documents are referenced herein in reliance
upon the authority of Arthur Andersen, as experts in accounting and auditing in
giving the report.
 
                                       16
<PAGE>   20
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
     NO ONE (INCLUDING ANY SALESMAN OR BROKER) IS AUTHORIZED TO PROVIDE ORAL OR
WRITTEN INFORMATION ABOUT THIS OFFERING THAT IS NOT INCLUDED IN THIS PROSPECTUS.
 
                           AUREAL SEMICONDUCTOR INC.
 
                              65,451,586 SHARES OF
                                  COMMON STOCK
 
                 ---------------------------------------------
                                   PROSPECTUS
                 ---------------------------------------------
 
                                 APRIL   , 1999
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   21
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following table sets forth the costs and expenses in connection with
the sale and distribution of the securities being registered, other than
underwriting discounts and commissions. All of the amounts shown are estimates
except the Securities and Exchange Commission registration fees.
 
<TABLE>
<CAPTION>
                                                              TO BE PAID
                                                                BY THE
                                                              REGISTRANT
                                                              ----------
<S>                                                           <C>
SEC registration............................................   $ 4,867
Accounting fees and expenses................................     7,500
Legal fees and expenses.....................................     7,500
Miscellaneous expenses......................................     5,133
                                                               -------
  Total.....................................................   $25,000
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     As permitted by Section 145 of the Delaware General Corporation Law (the
"DGCL"), the Registrant's Certificate of Incorporation provides that each person
who is or was or who had agreed to become a director or officer of the
Registrant or who had agreed at the request of the Registrant's Board of
Directors or an officer of the Registrant to serve as an employee or agent of
the Registrant or as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise, shall be
indemnified by the Registrant to the full extent permitted by the DGCL or any
other applicable laws. Such Certificate of Incorporation also provides that no
amendment or repeal of such Certificate of Incorporation shall apply to or have
any effect on the right to indemnification permitted or authorized thereunder
for or with respect to claims asserted before or after such amendment or repeal
arising from acts or omissions occurring in whole or in part before the
effective date of such amendment or repeal.
 
     The Registrant's Bylaws provide that the Registrant shall indemnify to the
full extent authorized by law any person made or threatened to be made a party
to an action or a proceeding, whether criminal, civil, administrative or
investigative, by reason of the fact that he, his testator or intestate was or
is a director, officer or employee of the Registrant or any predecessor of the
Registrant or serves or served any other enterprise as a director, officer or
employee at the request of the Registrant or an predecessor of the Registrant.
The Registrant's Bylaws also provide that the Registrant may enter into one or
more agreements with any person which provides for indemnification greater or
different than that provided in such Certificate of Incorporation.
 
     The Registrant has entered into indemnification agreements with its
directors and its officers.
 
     The Registrant intends to purchase and maintain insurance on behalf of any
person who is a director or officer against any loss arising from any claim
asserted against him and incurred by him in any such capacity, subject to
certain exclusions.
 
     See also the undertakings set out in response to Item 17 herein.
 
                                      II-1
<PAGE>   22
 
ITEM 16. EXHIBITS
 
     The following exhibits are filed with this Registration Statement:
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                       DESCRIPTION OF DOCUMENT
- -------                      -----------------------
<S>        <C>
 2.1       Agreement and Plan of Reorganization among the Company,
           Aureal Acquisition Corporation, a wholly-owned subsidiary of
           the Company and Crystal River Engineering, Inc., dated as of
           May 7, 1996(1)
 2.2       Second Amended Joint Plan of Reorganization dated November
           10, 1994(13)
 3.1       Second Amended and Restated Certificate of Incorporation of
           Aureal dated May 8, 1996(1)
 3.2       Restated Bylaws of Aureal Semiconductor Inc.(10)
 4.1       Common Stock Purchase Agreement by and among the Company and
           certain beneficial owners of 5% or more of the Company's
           Common Stock, as amended(2)
 4.2       Common Stock Purchase Agreement by and among the Company and
           certain entities and individuals dated June 10, 1996(3)
 4.3       Common Stock Purchase Agreement by and among the Company and
           certain entities and individuals dated August 6, 1997(4)
 4.4       Preferred Stock Regulation D Subscription Agreement(5)
 4.5       Certificate of Designation of Series A Preferred Stock of
           Aureal Semiconductor Inc.(5)
 4.6       Preferred Stock Registration Rights Agreement(5)
 4.7       Aureal Semiconductor Inc. Regulation D Subscription
           Agreement for Series C Preferred Stock(6)
 4.8       Certificate of Designation of Series C Preferred Stock of
           Aureal Semiconductor Inc.(6)
 4.9       Registration Rights Agreement (Common Stock underlying
           Series C Preferred Stock)(6)
 4.10      Loan and Security Agreement (Goldman and TBCC Credit
           Facility)(7)
 4.11      Form of Warrant (Goldman and TBCC Warrants)(7)
 4.12      8% Series B Convertible Preferred Stock Purchase
           Agreement(7)
 4.13      Certificate of Designation of 8% Series B Convertible
           Preferred Stock for Aureal Semiconductor Inc.(7)
 4.14      Amendment Number 4 to Registration Rights Agreement(7)
 4.20      Form of Registration Rights Agreement among Oaktree, TCW and
           the Company(14)
 5.1*      Opinion of Gray Cary Ware & Freidenrich LLP
10.1       Second Amended and Restated Loan Agreement between TCW
           Special Credits and the Company dated August 6, 1997
           increasing the loan commitment from $20 million to $31.5
           million(8)
10.2       1995 Stock Option Plan(9)
10.3       Form of incentive option agreement and non-statutory stock
           option agreement used under 1995 Stock Option Plan(2)
10.4       1994 Stock Option Plan(13)
10.5       Form of incentive option agreement and non-statutory stock
           option agreement used under 1994 Stock Option Plan(13)
10.6       Industrial Space Sublease with Chemical Waste Management,
           Inc. dated September 13, 1995(2)
10.7       Form of Indemnity Agreement for Directors and Officers(10)
</TABLE>
 
                                      II-2
<PAGE>   23
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                       DESCRIPTION OF DOCUMENT
- -------                      -----------------------
<S>        <C>
10.8       1996 Outside Directors Stock Option Plan(11)
10.9       Manufacturing, Purchase and Distribution Agreement between
           Diamond Multimedia Systems, Inc. and Aureal dated July 3,
           1998(12)
10.10      Form of Standby Commitment Agreement among Oaktree, TCW and
           the Company(14)
23.1       Consent of Arthur Andersen, LLP
23.2*      Consent of Gray Cary Ware & Freidenrich LLP (included in
           Exhibit 5.1)
24.1*      Power of Attorney (see page II-6 of the Registration
           Statement)
</TABLE>
 
- -------------------------
  *  Previously filed.
 
 (1) Incorporated by reference to the exhibits filed with Form 8-K dated May 22,
     1996.
 
 (2) Incorporated by reference to the exhibits filed with Form 10-K for the year
     ended December 31, 1995.
 
 (3) Incorporated by reference to the exhibits filed with Form S-3 (Registration
     number 333-3870) filed June 26, 1996.
 
 (4) Incorporated by reference to the exhibits filed with Form S-3 (as amended
     by Post-Effective Amendment No. 1, Registration number 333-3870) filed
     September 12, 1997.
 
 (5) Incorporated by reference to the exhibits filed with Aureal's Form 8-K on
     March 16, 1998.
 
 (6) Incorporated by reference to the exhibits filed with Aureal's Form 8-K on
     June 15, 1998.
 
 (7) Incorporated by reference to the exhibits filed with Form 8-K dated June
     15, 1998.
 
 (8) Incorporated by reference to the exhibits filed with Form 10-Q for the
     quarter ended September 28, 1997.
 
 (9) Incorporated by reference to the exhibits filed with Aureal's preliminary
     proxy on November 5, 1998.
 
(10) Incorporated by reference to the exhibits filed with Form 10-Q for the
     quarter ended September 29, 1996.
 
(11) Incorporated by reference to the exhibits filed with Form 10-K for the year
     ended December 29, 1996.
 
(12) Incorporated by reference to the exhibits filed with Form 10-Q for the
     quarter ended June 28, 1998.
 
(13) Incorporated by reference to the exhibits filed with Form 10-K for the year
     ended December 31, 1994.
 
(14) Incorporated by reference to the exhibits filed with Amendment No. 1 to
     Form S-3 (Registration number 333-75631) filed April 16, 1999.
 
                                      II-3
<PAGE>   24
 
ITEM 17. UNDERTAKINGS
 
     I. The undersigned Registrant hereby undertakes:
 
          A. To file, during any period in which offers or sales are being made,
     a post-effective amendment to this registration statement;
 
             1. To include any prospectus required by section 10(a)(3) of the
        Securities Act;
 
             2. To reflect in the prospectus any facts or events arising after
        the effective date of the registration statement (or the most recent
        post-effective amendment thereof) which, individually or in the
        aggregate, represent a fundamental change in the information set forth
        in the registration statement. Notwithstanding the foregoing, any
        increase or decrease in volume of securities offered (if the total
        dollar value of securities offered would not exceed that which was
        registered) and any deviation from the low or high end of the estimated
        maximum offering range may be reflected in the form of prospectus filed
        with the Commission pursuant to Rule 424(b) if, in the aggregate, the
        changes in volume and price represent no more than a 20% change in the
        maximum aggregate offering price set forth in the "Calculation of
        Registration Fee" table in the effective registration statement;
 
             3. To include any material information with respect to the plan of
        distribution not previously disclosed in the registration statement or
        any material change to such information in the registration statement;
        provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply
        if the information required to be included in a post-effective amendment
        by those paragraphs is contained in periodic reports filed by the
        Registrant pursuant to Section 13 or Section 15(d) of the Securities
        Exchange Act of 1934 that are incorporated by reference in the
        registration statement.
 
          B. That, for the purpose of determining any liability under the
     Securities Act, each such post-effective amendment shall be deemed to be a
     new registration statement relating to the securities offered therein, and
     the offering of such securities at that time shall be deemed to be the
     initial bona fide offering thereof.
 
          C. To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.
 
     II. The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to section 13(a) or section 15(d) of the
Securities Exchange Act of 1934 that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.
 
     III. The undersigned Registrant hereby undertakes to deliver or cause to be
delivered with the prospectus, to each person to whom the prospectus is sent or
given, the latest annual report to security holders that is incorporated by
reference in the prospectus and furnished pursuant to and meeting the
requirements of Rule 14a-3 or Rule 14c-3 under the Securities Exchange Act of
1934; and, where interim financial information required to be presented by
Article 3 of Regulation S-X are not set forth in the prospectus, to deliver, or
cause to be delivered to each person to whom the prospectus is sent or given,
the latest
 
                                      II-4
<PAGE>   25
 
quarterly report that is specifically incorporated by reference in the
prospectus to provide such interim financial information.
 
     IV. Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers, and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in The Securities Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer, or controlling person of the Registrant
in the successful defense of any action, suit, or proceeding) is asserted by
such director, officer, or controlling person in connection with the securities
being registered, the Registrant will, unless in the opinion of its counsel the
matter has been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.
 
     V. The undersigned Registrant hereby undertakes that:
 
          A. For the purposes of determining any liability under the Securities
     Act, the information omitted from the form of prospectus filed as part of
     this registration statement in reliance upon Rule 430A and contained in a
     form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4)or 497(h) under the Securities Act shall be deemed to be part of the
     registration statement as of the time it was declared effective.
 
          B. For the purposes of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of prospectus shall
     be deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.
 
                                      II-5
<PAGE>   26
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act, the Registrant has duly
caused this Post-Effective Amendment No. 1 to Registration Statement on Form S-2
to be signed on its behalf by the undersigned, thereunto duly authorized in the
City of Fremont, State of California on the 26th day of April, 1999.
 
                                          AUREAL SEMICONDUCTOR INC.
 
                                          By: /s/ DAVID J. DOMEIER
                                             -----------------------------------
                                              David J. Domeier,
                                              Vice President, Finance and
                                              Chief Financial Officer
 
     Pursuant to the requirements of the Securities Act, this Post-Effective
Amendment No. 1 to Registration Statement has been signed by the following
persons in the capacities and on the date indicated:
 
April 26, 1999
 
<TABLE>
<CAPTION>
                   SIGNATURE                                       TITLE
                   ---------                                       -----
<S>                                               <C>
 
/s/ KENNETH A. KOKINAKAS                             President, Chief Executive Officer
- ------------------------------------------------
Kenneth A. Kokinakas
 
/s/ DAVID J. DOMEIER                              Vice President, Chief Financial Officer
- ------------------------------------------------        and Chief Accounting Officer
David J. Domeier
 
/s/ L. WILLIAM KRAUSE*                                            Director
- ------------------------------------------------
L. William Krause
 
/s/ D. RICHARD MASSON*                                            Director
- ------------------------------------------------
D. Richard Masson
 
/s/ THOMAS K. SMITH, JR.*                                         Director
- ------------------------------------------------
Thomas K. Smith, Jr.*
 
/s/ RICHARD E. CHRISTOPHER*                                       Director
- ------------------------------------------------
Richard E. Christopher
 
*By: /s/ DAVID J. DOMEIER                                    (Attorney-in-fact)
- ------------------------------------------------
     David J. Domeier
</TABLE>
 
                                      II-6
<PAGE>   27
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                       DESCRIPTION OF DOCUMENT
- -------                      -----------------------
<S>        <C>
 2.1       Agreement and Plan of Reorganization among the Company,
           Aureal Acquisition Corporation, a wholly-owned subsidiary of
           the Company and Crystal River Engineering, Inc., dated as of
           May 7, 1996(1)
 2.2       Second Amended Joint Plan of Reorganization dated November
           10, 1994(13)
 3.1       Second Amended and Restated Certificate of Incorporation of
           Aureal dated May 8, 1996(1)
 3.2       Restated Bylaws of Aureal Semiconductor Inc.(10)
 4.1       Common Stock Purchase Agreement by and among the Company and
           certain beneficial owners of 5% or more of the Company's
           Common Stock, as amended(2)
 4.2       Common Stock Purchase Agreement by and among the Company and
           certain entities and individuals dated June 10, 1996(3)
 4.3       Common Stock Purchase Agreement by and among the Company and
           certain entities and individuals dated August 6, 1997(4)
 4.4       Preferred Stock Regulation D Subscription Agreement(5)
 4.5       Certificate of Designation of Series A Preferred Stock of
           Aureal Semiconductor Inc.(5)
 4.6       Preferred Stock Registration Rights Agreement(5)
 4.7       Aureal Semiconductor Inc. Regulation D Subscription
           Agreement for Series C Preferred Stock(6)
 4.8       Certificate of Designation of Series C Preferred Stock of
           Aureal Semiconductor Inc.(6)
 4.9       Registration Rights Agreement (Common Stock underlying
           Series C Preferred Stock)(6)
 4.10      Loan and Security Agreement (Goldman and TBCC Credit
           Facility)(7)
 4.11      Form of Warrant (Goldman and TBCC Warrants)(7)
 4.12      8% Series B Convertible Preferred Stock Purchase
           Agreement(7)
 4.13      Certificate of Designation of 8% Series B Convertible
           Preferred Stock for Aureal Semiconductor Inc.(7)
 4.14      Amendment Number 4 to Registration Rights Agreement(7)
 4.20      Form of Registration Rights Agreement among Oaktree, TCW and
           the Company(14)
 5.1*      Opinion of Gray Cary Ware & Freidenrich LLP
10.1       Second Amended and Restated Loan Agreement between TCW
           Special Credits and the Company dated August 6, 1997
           increasing the loan commitment from $20 million to $31.5
           million(8)
10.2       1995 Stock Option Plan(9)
10.3       Form of incentive option agreement and non-statutory stock
           option agreement used under 1995 Stock Option Plan(2)
10.4       1994 Stock Option Plan(13)
10.5       Form of incentive option agreement and non-statutory stock
           option agreement used under 1994 Stock Option Plan(13)
10.6       Industrial Space Sublease with Chemical Waste Management,
           Inc. dated September 13, 1995(2)
10.7       Form of Indemnity Agreement for Directors and Officers(10)
10.8       1996 Outside Directors Stock Option Plan(11)
</TABLE>
<PAGE>   28
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                       DESCRIPTION OF DOCUMENT
- -------                      -----------------------
<S>        <C>
10.9       Manufacturing, Purchase and Distribution Agreement between
           Diamond Multimedia Systems, Inc. and Aureal dated July 3,
           1998(12)
10.10      Form of Standby Commitment Agreement among Oaktree, TCW and
           the Company(14)
23.1       Consent of Arthur Andersen, LLP
23.2*      Consent of Gray Cary Ware & Freidenrich LLP (included in
           Exhibit 5.1)
24.1*      Power of Attorney (see page II-6 of the Registration
           Statement)
</TABLE>
 
- -------------------------
  *  Previously filed.
 
 (1) Incorporated by reference to the exhibits filed with Form 8-K dated May 22,
     1996.
 
 (2) Incorporated by reference to the exhibits filed with Form 10-K for the year
     ended December 31, 1995.
 
 (3) Incorporated by reference to the exhibits filed with Form S-3 (Registration
     number 333-3870) filed June 26, 1996.
 
 (4) Incorporated by reference to the exhibits filed with Form S-3 (as amended
     by Post-Effective Amendment No. 1, Registration number 333-3870) filed
     September 12, 1997.
 
 (5) Incorporated by reference to the exhibits filed with Aureal's Form 8-K on
     March 16, 1998.
 
 (6) Incorporated by reference to the exhibits filed with Aureal's Form 8-K on
     June 15, 1998.
 
 (7) Incorporated by reference to the exhibits filed with Form 8-K dated June
     15, 1998.
 
 (8) Incorporated by reference to the exhibits filed with Form 10-Q for the
     quarter ended September 28, 1997.
 
 (9) Incorporated by reference to the exhibits filed with Aureal's preliminary
     proxy on November 5, 1998.
 
(10) Incorporated by reference to the exhibits filed with Form 10-Q for the
     quarter ended September 29, 1996.
 
(11) Incorporated by reference to the exhibits filed with Form 10-K for the year
     ended December 29, 1996.
 
(12) Incorporated by reference to the exhibits filed with Form 10-Q for the
     quarter ended June 28, 1998.
 
(13) Incorporated by reference to the exhibits filed with Form 10-K for the year
     ended December 31, 1994.
 
(14) Incorporated by reference to the exhibits filed with Amendment No. 1 to
     Form S-3 (Registration number 333-75631) filed April 16, 1999.

<PAGE>   1

                                                                    EXHIBIT 23.1


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

           As independent public accountants, we hereby consent to the
incorporation by reference in this registration statement of our report dated
March 31, 1999 included in Aureal Semiconductor Inc.'s Form 10-K/A-1 for the
year end January 3, 1999 and to all references to our Firm included in this
registration statement.


                                        /s/ ARTHUR ANDERSEN LLP
                                        ----------------------------------------
                                        ARTHUR ANDERSEN LLP


San Jose, California
April 15, 1999



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