Editing Apple IIGS (section)

== Sound ==
The IIGS uses the '''Ensoniq 5503 Digital Oscillator Chip''': 32 independent oscillators, volume control and digitising, with '''64 KB of RAM dedicated to waveform storage''', talking to the 65C816 through the Sound GLU.<ref name="iigs-hw" />

'''The built-in sound output is a single mixed channel.''' Apple's own wording is that "sound is output via the built-in speaker, external speaker jack, or molex connector on the main logic board".<ref name="iigs-hw" /> The oscillator control registers carry channel-address bits, but those bits drive an '''optional external demultiplexer''': "Connecting a demultiplexer to the 7-pin molex connector will allow you to use up to eight separate sound channels."<ref name="iigs-hw" /> That connector is '''J-25''' and it also carries the analogue-to-digital converter input.<ref name="iigs-hw" />

In other words, the stereo and multi-channel output people associate with the IIGS comes from a third-party card plugged into J-25. A stock machine is mono, and there are no "two 8-bit DACs" on the board.