Editing Apple IIGS (section)

=== Audio ===
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The Apple IIGS's sound is provided by an Ensoniq 5503 DOC (Digital Oscillator Chip) [[wavetable synthesis]] chip designed by [[Bob Yannes]], creator of the [[MOS Technology 6581|SID]] synthesizer chip used in the [[Commodore 64]]. The ES5503 DOC is the same chip used in [[Ensoniq Mirage]] and [[Ensoniq ESQ-1]] professional-grade [[synthesizer]]s. The chip has 32 oscillators, which allows for a maximum of 32 voices (with limited capabilities when all used independently), though Apple's [[firmware]] pairs them for 16 voices, to produce fuller and more flexible sound, as do most of the standard tools of the operating system (the Apple MIDISynth toolset goes even a step further for richer sound, grouping four oscillators per voice, for a limit of seven-voice audio). The IIGS is often referred to as a 15-voice system, because one voice, or "sound generator" consisting of two oscillators, is always reserved as a dedicated clock for the sound chip's timing [[interrupt]] generator. Software that does not use the system firmware, or uses custom-programmed tools (certain games, demos, and music software), can access the chip directly and take advantage of all 32 voices.

A standard {{frac|1|8}}-inch headphone jack is on the back of the case, and standard stereo computer speakers can be attached there. This jack provides only [[monaural sound]] and a third-party adapter card is required for stereo;<ref name="chien198704">{{cite magazine | url=https://archive.org/stream/byte-magazine-1987-04/1987_04_BYTE_12-04_Instruction_Set_Strategies#page/n245/mode/2up | title=The Apple IIGS | magazine=[[Byte (magazine)|BYTE]] |publisher=UBM Technology Group|volume=10|number=4|issn=0360-5280|oclc=637876171| date=April 1987 | access-date=5 November 2013 | author=Chien, Philip | pages=223}}</ref> despite that, the Ensoniq and virtually all native software produces stereo audio. The Ensoniq can drive 16 speaker output channels, but the [[Molex connector|Molex]] expansion connector Apple provided only allows 8. There is 64 KB of dedicated memory (DOC-RAM) on the IIGS motherboard, separate from system memory, for the Ensoniq chip to store its sampled wavetable instruments.

To exploit the IIGS's audio capabilities, during its introduction, Apple sold [[Bose Corporation|Bose]] [[Apple speakers#Bose RoomMate speakers|Roommate]] amplified speakers for the computer (matching its platinum color and with custom Bose/Apple logo grille covers).