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                                 NINTH AMENDMENT
                             TO AMENDED AND RESTATED
                           REVOLVING CREDIT AGREEMENT
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      Ninth  Amendment  dated as of  September  30, 1998 to Amended and Restated
Revolving  Credit  Agreement  (the  "Ninth   Amendment"),   by  and  among  AVID
TECHNOLOGY,  INC., a Delaware  corporation (the  "Borrower"),  BANKBOSTON,  N.A.
(FORMERLY  KNOWN AS THE FIRST  NATIONAL  BANK OF BOSTON)  and the other  lending
institutions  listed on  SCHEDULE  1 to the  Credit  Agreement  (as  hereinafter
defined)  (the  "Banks") and  BANKBOSTON,  N.A., as agent for the Banks (in such
capacity, the "Agent"),  amending certain provisions of the Amended and Restated
Revolving  Credit  Agreement dated as of June 30, 1995 (as amended and in effect
from time to time, the "Credit Agreement") by and among the Borrower,  the Banks
and the Agent.  Terms not  otherwise  defined  herein  which are  defined in the
Credit Agreement shall have the same respective meanings herein as therein.

      WHEREAS,  the  Borrower,  the Banks and the  Agent  have  agreed to modify
certain terms and conditions of the Credit  Agreement as specifically  set forth
in this Ninth Amendment;

      NOW, THEREFORE, in consideration of the premises and the mutual agreements
contained herein and for other good and valuable consideration,  the receipt and
sufficiency of which are hereby acknowledged, the parties hereto hereby agree as
follows:

      SS.1. AMENDMENT  TO SS.1 OF  THE  CREDIT  AGREEMENT.  Section  1.1  of the
Credit Agreement is hereby amended as follows:

      (a) the definition of "Consolidated Operating Cash Flow" is hereby amended
by  inserting   immediately   after  the  words  "PLUS  (ii)   depreciation  and
amortization  for such  period"  the  words  "PLUS  (iii) any  pre-tax  non cash
writedowns   taken  in  the  fiscal   quarter   ended   September  30,  1998  of
acquired-in-process   research  and   development   relating  to  the  Softimage
Acquisition, up to an aggregate amount of not more than $193,741,000"

      (b) the definition of "Consolidated  Tangible Net Worth" is hereby amended
by (i)  deleting  the  period  which  appears  at the  end of the  text  of such
definition  and  substituting  in place thereof a semicolon;  and (ii) inserting
immediately  after the end of the text of such  definition the words  "PROVIDED,
HOWEVER,  for purposes of calculating  compliance with ss.8.2 and ss.8.4 hereof,
any after-tax non cash  writedowns  taken in the fiscal quarter ended  September
30,  1998  of  acquired-in-process  research  and  development  relating  to the
Softimage Acquisition,  up to an aggregate amount of not more than $149,374,000,
which would otherwise be required to be deducted from Consolidated  Tangible Net
Worth  shall not be  deducted  for  purposes of ss.8.2 and ss.8.4 of this Credit
Agreement."


      SS.2. AMENDMENT  TO SS.6 OF THE  CREDIT  AGREEMENT.  Section  6.12  of the
Credit  Agreement  is  hereby  amended  by  deleting  the text of ss.6.12 in its
entirety and restating it as follows:

            6.12.  USE OF PROCEEDS.  The  Borrower  will use the proceeds of the
      Loans solely for working capital and general corporate purposes,  and will
      not use any proceeds of the Loans to purchase or otherwise  acquire any of
      the Borrower's capital stock.

      SS.3. AMENDMENT  TO SS.7 OF  THE  CREDIT  AGREEMENT.  Section  7.4  of the
Credit  Agreement  is  hereby  amended  by  deleting  the  text of ss.7.4 in its
entirety and restating it as follows:

            7.4.  DISTRIBUTIONS.  The Borrower will not make any  Distributions;
      PROVIDED,  HOWEVER,  so long as no Event of Default  has  occurred  and is
      continuing  or would  exist as a result  thereof,  the  Borrower  shall be
      permitted to make  Distributions for the repurchase by the Borrower of its
      capital stock.

      SS.4. AMENDMENT TO SS.8 OF THE CREDIT AGREEMENT. Section 8.4 of the Credit
Agreement is hereby amended by inserting  immediately  after the words "PLUS one
hundred  percent  (100%) of the net  proceeds  of any new  equity  issued by the
Borrower or any of its Subsidiaries" the words "LESS (d) the aggregate  purchase
price of all capital stock of the Borrower  repurchased by the Borrower  through
the date of determination"

      SS.5.   CONDITIONS  TO  EFFECTIVENESS.  This  Ninth  Amendment  shall  not
become  effective  until  the  Agent  receives  a  counterpart  of this  Ninth
Amendment executed by the Borrower, the Majority Banks and the Agent.

      SS.6.  REPRESENTATIONS AND WARRANTIES. The Borrower hereby repeats, on and
as of the date hereof,  each of the representations and warranties made by it in
ss.5 of the  Credit  Agreement,  PROVIDED,  that all  references  therein to the
Credit  Agreement  shall refer to such Credit  Agreement as amended  hereby.  In
addition,  the Borrower  hereby  represents  and warrants that the execution and
delivery by the  Borrower of this Ninth  Amendment  and the  performance  by the
Borrower of all of its agreements and obligations  under the Credit Agreement as
amended hereby are within the corporate  authority of the Borrower and have been
duly authorized by all necessary corporate action on the part of the Borrower.

      SS.7.  RATIFICATION,  ETC. Except as expressly amended hereby,  the Credit
Agreement and all  documents,  instruments  and agreements  related  thereto are
hereby  ratified and confirmed in all respects and shall  continue in full force
and effect.  The Credit  Agreement  and this Ninth  Amendment  shall be read and
construed as a single  agreement.  All references in the Credit Agreement or any
related agreement or instrument to the Credit Agreement shall hereafter refer to
the Credit Agreement as amended hereby.

      SS.8.   NO WAIVER.  Nothing  contained  herein  shall  constitute a waiver
of, impair or otherwise  affect any  Obligations,  any other obligation of the
Borrower or any rights of the Agent or the Banks consequent thereon.

      SS.9.   COUNTERPARTS.  This  Ninth  Amendment  may be  executed  in one or
more  counterparts,  each of which  shall be  deemed  an  original  but  which
together shall constitute one and the same instrument.

      SS.10.  GOVERNING  LAW.  THIS NINTH  AMENDMENT  SHALL BE GOVERNED  BY, AND
CONSTRUED IN ACCORDANCE  WITH, THE LAWS OF THE  COMMONWEALTH OF  MASSACHUSETTS
(WITHOUT REFERENCE TO CONFLICT OF LAWS).


      IN WITNESS WHEREOF,  the parties hereto have executed this Ninth Amendment
as a document under seal as of the date first above written.

                                    AVID TECHNOLOGY, INC.



                                    By: /s/ William L. Flaherty
                                       ------------------------
                                    Title: Senior Vice President of Finance,
                                           Chief Financial Officer, and
                                           Treasurer


                                    BANKBOSTON, N.A.,
                                       individually and as Agent



                                    By: /s/ John B. Desmond
                                        -----------------------
                                    Title: Vice President



                                    ABN AMRO BANK N.V.


                                    By: /s/ Bruce Swords
                                        -----------------------
                                    Title: Vice President