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The sound system for the Power Macintosh G3 computers is implemented entirely on the Apple DVD-Video and Audio/Video Card, Apple Audio Input/Ouput Card, or Apple Audio/Video Input/Output Card. Each supports 16-bit stereo sound output and input, available simultaneously.
Like other AV class Macintosh computers, the sound circuitry on the Apple DVD-Video and Audio/Video, Audio, and Audio/Video input/output cards and system software can create sounds digitally and either play the sounds through speakers inside the enclosure or send the sound signals out through the sound output jacks. The Power Macintosh G3 computers also record sound from several sources: a microphone connected to the line-level sound input jack, the sound in ports on the video input module, analog sound from an optional modem card connected to the internal modem connector, a compact disc in the CD-ROM player, or analog sound from a cross-platform card in a PCI slot. With each sound input source, sound playthrough can be enabled or disabled.
The Apple DVD-Video and Audio/Video Card does not support the all-in-one enclosure, nor does it support analog sound from cross-platform PCI cards.