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Path: utzoo!linus!philabs!seismo!hao!hplabs!hp-pcd!grant
From: grant@hp-pcd.UUCP (grant)
Newsgroups: net.micro
Subject: Re: Orphaned Response - (nf)
Message-ID: <4344@hp-pcd.UUCP>
Date: Sat, 21-Jan-84 03:47:07 EST
Article-I.D.: hp-pcd.4344
Posted: Sat Jan 21 03:47:07 1984
Date-Received: Sun, 22-Jan-84 07:44:34 EST
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Organization: Hewlett-Packard, Corvallis OR
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#R:sri-arpa:-1459800:hp-kirk:10500010:37777777600:228
hp-kirk!grant    Dec 27 10:44:00 1983

The "audio in" pin on the 5pin DIN connector is an input to the SID chip.
According to the Programmer's manual, it is tied to the External (aux) 
pin of SID, and can be mixed with the other voices and/or run through the
filter.