ADVENT VII L P
SC 13G/A, 1997-02-13
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<PAGE>   1
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                  SCHEDULE 13G
 
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 1)*
 
                              OnTrak Systems, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)
 
                           Common Stock, No Par Value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)
 
                                  683374 10 2
- --------------------------------------------------------------------------------
                                 (CUSIP Number)
 
Check the following box if a fee is being paid with this / / statement. (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)
 
*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 the
disclosures provided in a prior cover page.
 
The information required in 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 page(s))
 
                               Page 1 of 4 Pages
 
SEC 1745 (10-85)
<PAGE>   2
 
CUSIP NO. 683374 10 2               13G                      PAGE 2 OF 4 PAGES
 
<TABLE>
<S> <C>
- --------------------------------------------------------------------------------------------------------------
  1   NAME OF REPORTING PERSON

      Advent VII L.P.                                          04-3181563
      Advent Industrial II L.P.                                51-0314268
      Advent New York L.P.                                     04-3095408
      Advent Atlantic and Pacific II L.P.                      04-3123521
      TA Venture Investors Limited Partnership                 04-3068354 
        
- --------------------------------------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 
      (a)  /X/       (b)  / /
- --------------------------------------------------------------------------------------------------------------
  3   SEC USE ONLY

- --------------------------------------------------------------------------------------------------------------
  4   CITIZENSHIP OR PLACE OF ORGANIZATION

      Advent VII L.P.                                          Delaware
      Advent Industrial II L.P.                                Delaware
      Advent New York L.P.                                     Delaware
      Advent Atlantic and Pacific II L.P.                      Delaware
      TA Venture Investors Limited Partnership                 Massachusetts

- --------------------------------------------------------------------------------------------------------------
                     5     SOLE VOTING POWER

                           Advent VII L.P.                            879,040
                           Advent Industrial II L.P.                   82,069
                           Advent New York L.P.                        87,903 
                           Advent Atlantic and Pacific II L.P.        227,637 
                           TA Venture Investors Limited Partnership    13,187
      NUMBER OF
       SHARES        -----------------------------------------------------------------------------------------
    BENEFICIALLY     6     SHARED VOTING POWER
      OWNED BY
        EACH               N/A
      REPORTING      -----------------------------------------------------------------------------------------
       PERSON        7     SOLE DISPOSITIVE POWER
        WITH
                           Advent VII L.P.                            879,040
                           Advent Industrial II L.P.                   82,069
                           Advent New York L.P.                        87,903
                           Advent Atlantic and Pacific II L.P.        227,637   
                           TA Venture Investors Limited Partnership    13,187

                     ------------------------------------------------------------------------------------------
                     8     SHARED DISPOSITIVE POWER 

                           N/A   

- ---------------------------------------------------------------------------------------------------------------
  9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
      Advent VII L.P.                                                 879,040
      Advent Industrial II L.P.                                        82,069
      Advent New York L.P.                                             87,903 
      Advent Atlantic and Pacific II L.P.                             227,637
      TA Venture Investors Limited Partnership                         13,187

- ---------------------------------------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

- ---------------------------------------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

      Advent VII L.P.                                                    9.10
      Advent Industrial II L.P.                                           .85
      Advent New York L.P.                                                .91
      Advent Atlantic and Pacific II L.P.                                2.36
      TA Venture Investors Limited Partnership                            .14

- --------------------------------------------------------------------------------------------------------------
 12   TYPE OF REPORTING PERSON

      Each entity is a Limited Partnership

- --------------------------------------------------------------------------------------------------------------
 
</TABLE>
 
                      *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   3
 
SCHEDULE 13G                                                   Page 3 of 4 Pages
 
<TABLE>
<S>         <C>    <C>                                              <C>
Item 1:     (a)    Name of Issuer: OnTrak Systems, Inc.

            (b)    Address of Issuer's Principal Executive Offices: 1753 South Main Street
                                                                    San Jose, CA 95035

Item 2:     (a)    Name of Person Filing:
                   Advent VII L.P.
                   Advent Industrial II L.P.
                   Advent New York L.P.
                   Advent Atlantic and Pacific II L.P.
                   TA Venture Investors Limited Partnership

            (b)    Address of Principal Business Office: 
                   c/o TA Associates
                   125 High Street, Suite 2500
                   Boston, MA 02110

            (c)    Citizenship: Not Applicable

            (d)    Title of Class of Securities: Common Stock, No Par Value

            (e)    CUSIP Number: 683374 10 2

Item 3:            If this statement is filed pursuant to 
                   Rules 13d-1(b) or 13d-2(b), check 
                   whether the person filing is a: 
                   Not Applicable       

Item 4:            OWNERSHIP

            (a)    Amount Beneficially Owned:                       Common Stock
                                                                    ------------
                   Advent VII L.P.                                     879,040  
                   Advent Industrial II L.P.                            82,069 
                   Advent New York L.P.                                 87,903
                   Advent Atlantic and Pacific II L.P.                 227,637
                   TA Venture Investors Limited Partnership             13,187

            (b)    Percent of Class:                                Percentage
                                                                    ----------
                   Advent VII L.P.                                     9.10
                   Advent Industrial II L.P.                            .85
                   Advent New York L.P.                                 .91
                   Advent Atlantic and Pacific II L.P.                 2.36
                   TA Venture Investors Limited Partnership             .14

            (c)    Number of shares as to which such person has:
                   (i)   sole power to vote or direct the vote:     Common Stock
                                                                    ------------
                   Advent VII L.P.                                     879,040  
                   Advent Industrial II L.P.                            82,069
                   Advent New York L.P.                                 87,903
                   Advent Atlantic and Pacific II L.P.                 227,637
                   TA Venture Investors Limited Partnership             13,187

                   (ii)  shared power to vote or direct the vote:          N/A
                   (iii) sole power to dispose or direct the        Common Stock
                         disposition:                               ------------

                   Advent VII L.P.                                     879,040
                   Advent Industrial II L.P.                            82,069
                   Advent New York L.P.                                 87,903
                   Advent Atlantic and Pacific II L.P.                 227,637
                   TA Venture Investors Limited Partnership             13,187 

                   (iv)  shared power to dispose or direct the 
                         disposition                                       N/A

<FN> 
- ---------------
* This Schedule 13G is filed pursuant to Rule 13d-1(f) on behalf of ___________.
</TABLE>
<PAGE>   4
 
SCHEDULE 13G                                                   Page 4 of 4 Pages
 
<TABLE>
<S>                <C>
Item 5:            Ownership of Five Percent or Less of a Class: Not Applicable

Item 6:            Ownership of More than Five Percent on Behalf of Another Person:
                   Not Applicable

Item 7:            Identification and Classification of the Subsidiary Which Acquired
                   the Security Being Reported on By the Parent Holding Company:
                   Not Applicable

Item 8:            Identification and Classification of Members of the Group:
                   This schedule 13G is filed pursuant to Rule 13d-1(c). For
                   the agreement of group members to a joint filing, see below.

Item 9:            Notice of Dissolution of Group: Not Applicable

Item 10:           Certification: Not Applicable
</TABLE>
 
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.

AGREEMENT FOR JOINT FILING
Advent VII, L.P., Advent Industrial II L.P., Advent New York L.P., Advent
Atlantic and Pacific II L.P., and TA Venture Investors Limited Partnership,
hereby agree that TA Associates shall file with the Securities and Exchange
Commission a joint schedule 13G on behalf of the above-named parties concerning
their beneficial ownership of OnTrak Systems, Inc.



Dated:


ADVENT VII L.P.
By: TA Associates VII L.P., its General Partner
By: TA Associates, Inc. its General Partner

By: /s/ Katherine S. Cromwell
    -----------------------------------------------------
    Katherine S. Cromwell, Managing Director 


ADVENT INDUSTRIAL II L.P.
By: TA Associates VI L.P., its General Partner
By: TA Associates, Inc. its General Partner

By: /s/ Katherine S. Cromwell
    -----------------------------------------------------
    Katherine S. Cromwell, Managing Director 


ADVENT ATLANTIC AND PACIFIC II L.P.
By: TA Associates AAP II Partners L.P., its General Partner
By: TA Associates, Inc. its General Partner

By: /s/ Katherine S. Cromwell
    -----------------------------------------------------
    Katherine S. Cromwell, Managing Director 


ADVENT NEW YORK L.P.
By: TA Associates VI L.P., its General Partner
By: TA Associates, Inc. its General Partner

By: /s/ Katherine S. Cromwell
    -----------------------------------------------------
    Katherine S. Cromwell, Managing Director 


TA VENTURE INVESTORS LIMITED PARTNERSHIP

By: /s/ Katherine S. Cromwell
    -----------------------------------------------------
    Katherine S. Cromwell, General Partner


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