ONSET ENTERPRISE ASSOCIATES LP
SC 13D, 1998-03-24
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549




                                  SCHEDULE 13D
                                 (Rule 13d-101)

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934


                                 EUPHONIX, INC.
- --------------------------------------------------------------------------------
                              (Name of the Issuer)


                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    298416108
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                  Alexis Lakes
                               2490 Sand Hill Road
                          Menlo Park, California 94025
                                 (650) 529-0700
- --------------------------------------------------------------------------------

                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)


                                 March 18, 1998
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

         If the filing person has  previously  filed a statement on Schedule 13G
to report the  acquisition  which is the subject of this  Schedule  13D,  and is
filing this schedule because of Rule 13d-1(b)(3) or (4), check the following box
[X].

                  Note:  Six copies of this  statement,  including all exhibits,
         should  be filed  with the  Commission.  See Rule  13d-1(a)  for  other
         parties to whom copies are to be sent.

         The  remainder  of this cover page shall be filled out for a  reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

         The information  required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise  subject to the  liabilities of that section of
the Act but shall be subject to all other  provisions of the Act  (however,  see
the Notes).



                         (Continued on following pages)
                              (Page 1 of 10 pages)



<PAGE>

<TABLE>
<CAPTION>
<S>                                                      <C>                                <C>
- ------------------------------------------------------           ---------------------------------------------------
CUSIP NO. 298416108                                      13D     Page 2 of 10 pages
          -----------------                                 
- ------------------------------------------------------           ---------------------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSONS
            S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
            ONSET Enterprise Associates, L.P.
- ----------- --------------------------------------------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                                            (a)[ ]
                                                                                            (b)[X]
- ----------- --------------------------------------------------------------------------------------------------------
    3       SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
    4       SOURCE OF FUNDS
            WC
- ----------- --------------------------------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) 
            OR 2(e)   N/A                                                                      [ ]
- ----------- --------------------------------------------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware
- ----------------------------- --------- ----------------------------------------------------------------------------
                                 7      SOLE VOTING POWER
           NUMBER                       1,744,335
             OF
           SHARES
        BENEFICIALLY
          OWNED BY
         REPORTING
           PERSON
            WITH
                              --------- ----------------------------------------------------------------------------
                                 8      SHARED VOTING POWER
                                        -0-
                              --------- ----------------------------------------------------------------------------
                                 9      SOLE DISPOSITIVE POWER
                                        1,744,335
                              --------- ----------------------------------------------------------------------------
                                 10     SHARED DISPOSITIVE POWER
                                        -0-
- ----------- --------------------------------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            1,744,335
- ----------- --------------------------------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES
            N/A
- ----------- --------------------------------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
            26.32%
- ----------- --------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON   PN
- ----------- --------------------------------------------------------------------------------------------------------
</TABLE>
                                                (Page 2 of 10 pages)

<PAGE>

<TABLE>
<CAPTION>
<S>                                                      <C>                                <C>
- ------------------------------------------------------           ---------------------------------------------------
CUSIP NO. 298416108                                      13D     Page 3 of 10 pages
          -----------------                                 
- ------------------------------------------------------           ---------------------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSONS
            S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
            OEA Management, L.P.
- ----------- --------------------------------------------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                                            (a)[ ]
                                                                                            (b)[X]
- ----------- --------------------------------------------------------------------------------------------------------
    3       SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
    4       SOURCE OF FUNDS
            WC
- ----------- --------------------------------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) 
            OR 2(e)   N/A                                                                      [ ]
- ----------- --------------------------------------------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware
- ----------------------------- --------- ----------------------------------------------------------------------------
                                 7      SOLE VOTING POWER
           NUMBER                       1,744,335
             OF
           SHARES
        BENEFICIALLY
          OWNED BY
         REPORTING
           PERSON
            WITH
                              --------- ----------------------------------------------------------------------------
                                 8      SHARED VOTING POWER
                                        -0-
                              --------- ----------------------------------------------------------------------------
                                 9      SOLE DISPOSITIVE POWER
                                        1,744,335
                              --------- ----------------------------------------------------------------------------
                                 10     SHARED DISPOSITIVE POWER
                                        -0-
- ----------- --------------------------------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            1,744,335
- ----------- --------------------------------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES
            N/A                                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
            26.32%
- ----------- --------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON   PN
- ----------- --------------------------------------------------------------------------------------------------------
</TABLE>

                                                 (Page 3 of 10 pages)

<PAGE>

<TABLE>
<CAPTION>
<S>                                                      <C>                                <C>
- ------------------------------------------------------           ---------------------------------------------------
CUSIP NO. 298416108                                      13D     Page 4 of 10 pages
          -----------------                                 
- ------------------------------------------------------           ---------------------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSONS
            S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
            Robert F. Kuhling, Jr.
- ----------- --------------------------------------------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                                            (a)[ ]
                                                                                            (b)[X]
- ----------- --------------------------------------------------------------------------------------------------------
    3       SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
    4       SOURCE OF FUNDS

- ----------- --------------------------------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) 
            OR 2(e)   N/A                                                                      [ ]
- ----------- --------------------------------------------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION
            United States
- ----------------------------- --------- ----------------------------------------------------------------------------
                                 7      SOLE VOTING POWER
           NUMBER                       587
             OF
           SHARES
        BENEFICIALLY
          OWNED BY
         REPORTING
           PERSON
            WITH
                              --------- ----------------------------------------------------------------------------
                                 8      SHARED VOTING POWER
                                        1,744,335
                              --------- ----------------------------------------------------------------------------
                                 9      SOLE DISPOSITIVE POWER
                                        587
                              --------- ----------------------------------------------------------------------------
                                 10     SHARED DISPOSITIVE POWER
                                        1,744,335
- ----------- --------------------------------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            1,744,922
- ----------- --------------------------------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES
            N/A                                                                               [ ]
- ----------- --------------------------------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
            26.33%
- ----------- --------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON   IN
- ----------- --------------------------------------------------------------------------------------------------------
</TABLE>

                                                (Page 4 of 10 pages)

<PAGE>

<TABLE>
<CAPTION>
<S>                                                      <C>                                <C>
- ------------------------------------------------------           ---------------------------------------------------
CUSIP NO. 298416108                                      13D     Page 5 of 10 pages
          -----------------                                 
- ------------------------------------------------------           ---------------------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSONS
            S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
            Terry L. Opdendyk
- ----------- --------------------------------------------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                                            (a)[ ]
                                                                                            (b)[X]
- ----------- --------------------------------------------------------------------------------------------------------
    3       SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
    4       SOURCE OF FUNDS

- ----------- --------------------------------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) 
            OR 2(e)   N/A                                                                      [ ]
- ----------- --------------------------------------------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION
            United States
- ----------------------------- --------- ----------------------------------------------------------------------------
                                 7      SOLE VOTING POWER
           NUMBER                       587
             OF
           SHARES
        BENEFICIALLY
          OWNED BY
         REPORTING
           PERSON
            WITH
                              --------- ----------------------------------------------------------------------------
                                 8      SHARED VOTING POWER
                                        1,744,335
                              --------- ----------------------------------------------------------------------------
                                 9      SOLE DISPOSITIVE POWER
                                        587
                              --------- ----------------------------------------------------------------------------
                                 10     SHARED DISPOSITIVE POWER
                                        1,744,335
- ----------- --------------------------------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            1,744,922
- ----------- --------------------------------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES
            N/A                                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
            26.33%
- ----------- --------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON   IN
- ----------- --------------------------------------------------------------------------------------------------------
</TABLE>

                                                (Page 5 of 10 pages)

<PAGE>


Item 1.  Security and the Issuer

         (a)      Title of Security:

                  Common Stock

         (b)      Name of the Issuer:

                  Euphonix, Inc., a California corporation.

         (c)      The Issuer's principal executive office:

                  220 Portage Road
                  Palo Alto, CA   94306

                  Description of Business:

                  The  Issuer is  engaged in the  development,  manufacture  and
                  marketing of digitally  controlled  audio mixing  consoles for
                  use in the  production  of audio  content for the music,  post
                  production  (film  and  television),   broadcast,  live  sound
                  reinforcement  (live  concerts  and  theater)  and  multimedia
                  segments of the professional audio market.

Item 2.  Identity and Background

         (a)      Name of the Reporting Persons:

                  i.          ONSET Enterprise Associates, L.P. ("OEA"):
                  ii.         OEA Management, L.P. ("OEAM");
                  iii.        Robert F. Kuhling, Jr. ("Kuhling");
                  v.          Terry L. Opdendyk ("Opdendyk").

         (b)      Business address:

                  2490 Sand Hill Road
                  Menlo Park, CA  94025

         (c)      Present  principal  occupation  or  employment,  and the name,
                  principal  business  and address of any  corporation  or other
                  organization in which such employment is conducted:

                  OEA:        Venture Capital Fund
                  OEAM:       Venture Capital Fund
                  Kuhling:    General Partner of OEAM
                  Opdendyk:   General Partner of OEAM

                              (Page 6 of 10 pages)

<PAGE>

         (d)      Convictions in criminal proceedings since 1993:

                  None.

         (e)      Judgments for violations of Securities Laws since 1993:

                  None.

         (f)      Citizenship or Place of Organization

                  OEA:        Delaware
                  OEAM:       Delaware
                  Kuhling:    United States
                  Opdendyk:   United States

Item 3:  Source and Amount of Funds or Other Consideration.

         On October 31, 1990,  OEA  acquired  517,092  shares of Euphonix,  Inc.
("Euphonix")  Series A Preferred Stock for $517,092 using investment capital. On
March 11, 1991, OEA acquired 285,714 shares of Euphonix Series B Preferred Stock
for $500,000 using  investment  capital.  On May 31, 1991, OEA acquired  275,947
shares of  Euphonix  Series B  Preferred  Stock for  $482,907  using  investment
capital.  On November 5, 1991, OEA acquired  325,582 shares of Euphonix Series C
Preferred Stock for $700,001 using investment capital.

         On August 22, 1995, in connection  with the initial public  offering of
Issuer's  Common Stock (the "IPO"),  OEA received (i) 517,092 shares of Issuer's
Common Stock in exchange for its Series A Preferred  Stock,  (ii) 561,661 shares
of Issuer's  Common Stock in exchange for its Series B Preferred Stock and (iii)
325,582  shares of Issuer's  Common Stock in exchange for its Series C Preferred
Stock.

         On February 20, 1996,  Kuhling and Opdendyk each received 587 shares of
Issuer's  Common  Stock  for  no  consideration  as  the  result  of a pro  rata
distribution of shares by OEA to its general and limited partners.

         On March 18, 1998, OEA acquired 800,000 shares of Issuer's Common Stock
for $1,500,000 using investment capital.

Item 4.  Purpose of the Transaction

         Reporting  Persons  acquired the  securities  of Issuer for purposes of
investment.  Reporting Persons currently have no plans or proposals with respect
to Issuer.

                              (Page 7 of 10 pages)

<PAGE>

<TABLE>
Item 5.  Interest in Securities of the Issuer
<CAPTION>
<S>                                    <C>                    <C>                    <C>                   <C>
================================= ===================== ======================= ====================== =====================
                                          OEA                    OEAM                  Kuhling               Opdendyk
- --------------------------------- --------------------- ----------------------- ---------------------- ---------------------
Beneficial Ownership                   1,744,335              1,744,335              1,744,922             1,744,922
- --------------------------------- --------------------- ----------------------- ---------------------- ---------------------
Percentage of Class                       26.32%                 26.32%                 26.33%                26.33%
- --------------------------------- --------------------- ----------------------- ---------------------- ---------------------
Sole Voting Power                      1,744,335              1,744,335                    587                   587
- --------------------------------- --------------------- ----------------------- ---------------------- ---------------------
Shared Voting Power                            0                      0              1,744,335             1,744,335
- --------------------------------- --------------------- ----------------------- ---------------------- ---------------------
Sole Dispositive Power                 1,744,335              1,744,335                    587                   587
- --------------------------------- --------------------- ----------------------- ---------------------- ---------------------
Shared Dispositive Power                       0                      0              1,744,922             1,744,922
================================= ===================== ======================= ====================== =====================
</TABLE>


Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to
        Securities of the Issuer

        None.

Item 7. Material to be Filed as Exhibits

        Exhibit A:        Joint Filing Statement


                              (Page 1 of 10 pages)

<PAGE>


                                    SIGNATURE

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

ONSET ENTERPRISE ASSOCIATES, L.P.

By OEA Management, L.P.,
   its General Partner


By:  /s/ Terry L. Opdendyk                               March 20, 1998
     -------------------------------           ---------------------------------
     General Partner                           Date

OEA MANAGEMENT, L.P.


By:  /s/ Terry L. Opdendyk                               March 20, 1998
     -------------------------------           ---------------------------------
     General Partner                           Date


/s/ Robert F. Kuhling, Jr.                               March 20, 1998
- ------------------------------------           ---------------------------------
Robert F. Kuhling, Jr.                         Date


/s/ Terry L. Opdendyk                                    March 20, 1998
- ------------------------------------           ---------------------------------
Terry L. Opdendyk                              Date

                              (Page 2 of 10 pages)

<PAGE>


                                    EXHIBIT A

                             Joint Filing Statement

         We, the  undersigned,  hereby  express our agreement  that the attached
Schedule 13D is filed on behalf of each of us.

ONSET ENTERPRISE ASSOCIATES, L.P.

By OEA Management, L.P.,
   its General Partner


By:  /s/ Terry L. Opdendyk                               March 20, 1998
     -------------------------------           ---------------------------------
     General Partner                           Date

OEA MANAGEMENT, L.P.


By:  /s/ Terry L. Opdendyk                               March 20, 1998
     -------------------------------           ---------------------------------
     General Partner                           Date


/s/ Robert F. Kuhling, Jr.                               March 20, 1998
- ------------------------------------           ---------------------------------
Robert F. Kuhling, Jr.                         Date


/s/ Terry L. Opdendyk                                    March 20, 1998
- ------------------------------------           ---------------------------------
Terry L. Opdendyk                              Date


                              (Page 3 of 10 pages)



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