Path: utzoo!utgpu!watmath!isishq!Geoffrey.Welsh
From: Geoffrey.Welsh@isishq.FIDONET.ORG (Geoffrey Welsh)
Newsgroups: comp.sys.cbm
Subject: Re: Sound In?
Message-ID: <992.23AFEC5A@isishq.FIDONET.ORG>
Date: 16 Dec 88 15:47:51 GMT
Organization: International Student Information Service -- Headquarters
Lines: 36


 > From: js9b+@andrew.cmu.edu (Jon C. Slenk)
 > Message-ID: <cXdcoVy00Uo6A9KGEV@andrew.cmu.edu>
 
 > I saw an advertisement (in sharper image catalog) for a
 > unit that takes voice
 > input and then gives a smooth, instrumental output.
 
 > It struck me that the SID chip is a full synthesizer. Couldn't
 > it be set-up to
 > do much the same thing, but with greater variety?
 
   I'm no SID expert, but I'm sure the answer is "no"; at least not 

without extra hardware.
 
   The SID chip's input is not affected by the synthesizer aspect of 

the chip, so you couldn't use it to modulate some other output. If 
I remember correctly, the only thing that you could do to the input 
on the SID chip was pass it through the frequency filter (offering 
high-, low-, band-pass, and notch-reject modes).
 
   In order to modify an incoming signal, you'd have to be using analytical 

hardware (or some basic A/D hardware and analytical software) and then 
re-generate the desired sound from the SID. For more detail on that, 
you'd have to talk to people who've added sound interfaces to their 
64... I only played with the SID briefly when I got my first 64 back 
in '82 or '83.


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