Morgan Stanley, et al. – ‘SC 13G/A’ on 7/10/00 re: Pinnacle Systems Inc

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Amendment to Statement of Beneficial Ownership   —   Schedule 13G
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: SC 13G/A    13G Amendment Filing                                   5     17K 
 2: EX-99       Secretary's Certificate                                1      6K 

SC 13G/A   —   13G Amendment Filing
Document Table of Contents

SC 13G/A
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SECURITIES AND EXCHANGE COMMISSION  
Washington, D.C.  20549 

SCHEDULE 13G  

(Rule 13d-102)

 INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2

Under the Securities Exchange Act of 1934 
(Amendment No. 3 )

Pinnacle Systems, Inc.
----------------------------------------------------- 
(Name of Issuer)
Common Stock
 -----------------------------------------------------
(Title of Class of Securities)

 723481107
----------------------------------------------------- 
(CUSIP Number)

Check the following box if a fee is  being paid with this statement [ ].        

----------                                                                      
*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).                                                                         

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CUSIP No. 723481107                   13G                    Page 2  of 7  Pages

--------------------------------------------------------------------------------
1.  NAME OF REPORTING PERSON(S)                                           
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON(S)              

Morgan  Stanley Dean  Witter &  Co.                         
IRS  #  39-314-5972                                         

--------------------------------------------------------------------------------
2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                     
                                                   (a)  [  ]
                                                   (b)  [  ]

--------------------------------------------------------------------------------
3.  SEC USE ONLY                                                          

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

The state of organization is Delaware.                      

--------------------------------------------------------------------------------
NUMBER OF      5.   SOLE VOTING POWER                                     
SHARES            0                                                   
  BENEFICIALLY    --------------------------------------------------------------
OWNED BY      6.   SHARED VOTING POWER                                  
EACH             19,304                                             
   REPORTING      --------------------------------------------------------------
PERSON       7.   SOLE DISPOSITIVE POWER                              
WITH             0                                                  
                  --------------------------------------------------------------
8.   SHARED DISPOSITIVE POWER               
22,269                            
--------------------------------------------------------------------------------
9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON          

22,269                                                      

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

--------------------------------------------------------------------------------
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                      

.044%                                                       

--------------------------------------------------------------------------------
12.  TYPE OF REPORTING PERSON*                                              

IA, CO                                                      

--------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT! 

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CUSIP No. 723481107                     13G                   Page 3 of 7  Pages

Item 1.     (a)   Name of Issuer:                                               
Pinnacle Systems, Inc.                      
                  --------------------------------------------------------------
(b)   Address of Issuer's Principal Executive Offices:  
280 N. Bernardo Ave.                        
Mountain View, CA 94043                     
                  --------------------------------------------------------------
Item 2.     (a)   Name of Person Filing:                                        
          (a) Morgan Stanley Dean Witter & Co.

                  --------------------------------------------------------------
          (b)   Address of Principal Business Office, or if None, Residence:
(a) 1585 Broadway         
         New  York, New  York  10036

                  --------------------------------------------------------------
(c)   Citizenship:                                      
                       Incorporated  by  reference  to  Item  4  of  the
                          cover page  pertaining  to  each  reporting  person.

                               -------------------------------------------------
(d)   Title of Class of Securities:                     
Common Stock              
                  --------------------------------------------------------------
(e)   CUSIP Number:                                     
723481107                 
                               -------------------------------------------------

Item 3.     (a)   Morgan Stanley Dean Witter &  Co. is (e) an Investment Adviser
                  registered  under  Section 203 of the  Investment Advisers Act
of 1940.                                    

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CUSIP No. 723481107                  13-G                   Page 4 of 7   Pages 

Item 4.     Ownership.                                                          

               Incorporated  by  reference  to  Items  (5) - (9) and (11) of the
cover page.                                       

Item 5.     Ownership of Five Percent or Less of a Class.                       

                   As of the date hereof,  has Morgan Stanley Dean  Witter & Co.
                are known to have the right to receive or ceased to be the
                 beneficial  owner of more than five percent of the class of
securities.                               

Item 6.     Ownership of More Than Five Percent on Behalf of Another Person.    

Inapplicable                            

Item 7.     Identification and Classification of the Subsidiary which Acquired  
     the Security Being Reported on By the Parent Holding Company.

Item 8.     Identification and Classification of Members of the Group.          

Item 9.     Notice of Dissolution of Group.                                     

Item 10.    Certification.                                                      

               By signing  below I certify that, to the best of my knowledge and
               belief,  the  securities  referred to above were  acquired in the
               ordinary course of business and were not acquired for the purpose
               of and do not have the  effect of  changing  or  influencing  the
               control of the issuer of such securities and were not acquired in
               connection  with or as a participant  in any  transaction  having
such purpose or effect.                           

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CUSIP No. 723481107                   13-G                   Page 5 of  7  Pages

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.                

Date:       July 10, 2000                                                       

Signature:  /s/  Dennine Bullard                                                
         -----------------------------------------------------------------

Name/Title  Dennine Bullard / Morgan Stanley & Co.  Incorporated                
         -----------------------------------------------------------------
MORGAN STANLEY DEAN WITTER & CO.                        

                    INDEX TO EXHIBITS                                 PAGE
                    -----------------                                 ----

EXHIBIT 1       Agreement to Make a Joint Filing                          6     

EXHIBIT 2       Secretary's Certificate Authorizing Paul A. Frick         7     
    to Sign on behalf of Miller Anderson & Sherrerd, LLP

* Attention. Intentional misstatements or omissions of fact constitute federal  
criminal violations (see 18 U.S.C. 1001).                                   

(022597DTI)                                                                     

Dates Referenced Herein   and   Documents Incorporated by Reference

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