Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!brutus.cs.uiuc.edu!ux1.cso.uiuc.edu!ux1.cso.uiuc.edu!uxa.cso.uiuc.edu!krb20699
From: krb20699@uxa.cso.uiuc.edu
Newsgroups: comp.sys.apple
Subject: Re: Reply to: Using sound files on Info
Message-ID: <113300233@uxa.cso.uiuc.edu>
Date: 25 Dec 89 10:38:32 GMT
References: <8912211757.AK00033@adam.DG.COM>
Lines: 31
Nf-ID: #R:<8912211757.AK00033@adam.DG.COM>:-32:uxa.cso.uiuc.edu:113300233:000:1555
Nf-From: uxa.cso.uiuc.edu!krb20699    Dec 24 06:55:00 1989


Written by Bruce_Kahn@DGC.MCEO.DG.COM in comp.sys.apple

>CEO comments:
>From: Bruce Kahn:VOID
>Date: ## 12/21/89 12:55 ##
>  Mac sound files can only be played by a program that can read them 
>such as PlaySound or MacCD (both of which are on 
>Sumex-Aim.Stanford.Edu in the archives some place).  If you use Apple 
>File Exchange, you can 'port' sound files back and forth between 
>Apple II's and Mac's.  I believe that if the sound contains an 
>80H (hex) on the Mac, you need to change it to a 00H on the Apple 
>II.  Otherwise the sound will be garbage.

[...clip...]

>                                   Bruce (KAHN@ADAM.DG.COM)

     I don't think changing $80 to $00 is a solution.  A $00 byte in sound
files is what makes Mac sounds distort on the IIgs.  To convert sound files
I change all instances of $00 to $01.  This eliminates the distortion while
only changing the pitch at these points by 1/256th.  Mac and II sounds are
identical except for the lack of 'support' of $00 by the IIgs.  I'm not
sure why the Ensoniq chip doesn't like it, but I heard someone explain why
awhile back...something about cancelling all previous sound or the like.

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