The reference card contained 1 MB μ-law ADPCM compressed sound ROM, which contained basic General MIDI voices and sound samples to help FM emulation, and 2 slots for RAM expansion through 30-pin SIMMs. A converter utility, GIPC, was provided for making. There were 4 versions of the sound bank: a full 16-bit 4 MB with 8-bit downsampled 2 MB version, and 16-bit 2 MB (different sample looping) with 8-bit downsampled 1 MB version. FFF/.DAT sound bank format, resembling SoundFont, which could be either ROM or RAM based. The sound "patch set" was reworked from a collection of individual instrument. It was compatible with CS4231 codec installed in the UltraSound MAX or 16-bit recording daughterboard for the UltraSound Classic. It was enhanced to handle up to 16 MB of onboard memory, IMA ADPCM-compressed samples, have no sample rate drop at full 32 voices, and featured additional logic to support hardware emulation of FM synthesis and simple delay-based digital sound effects such as reverb and chorus. The chip, released in 1995, was named AMaDeus, with the AMD part number of Am78C201 and was marketed as InterWave. The great potential of the original UltraSound enabled Advanced Gravis to license the new GFA1 chip and software to AMD, who were trying to make it into the sound chip market at the time.
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