A standard -inch headphone jack is provided on the back of the case, and standard stereo computer speakers can be attached there. However, this jack provides only mono sound and a third-party adapter card is required for stereo, despite the fact that the Ensoniq and virtually all native software produces stereo audio (stereo audio is essentially built into the machine, but has to be de-multiplexed by third-party cards). The Ensoniq is capable of driving 16 speaker channels, however the molex expansion connector Apple provided only allows for 8 channels, while most stereo card only provided for 2 channel--left/right stereo. MDIdeas SuperSonic and Applied Engineering's SonicBlaster are one of a few developed cards for this purpose, as well as provide an input to the Ensoniq's built in ADC for capturing and recording real-world sound into the computer. 64 KB of dedicated sound memory (DOC-RAM) is built-in on the IIGS's motherboard, separate from system memory, for the Ensoniq chip to store its sampled wavetable instruments.