- one of the last InterWave cards was designed for Compaq Presario desktops. Newer "C" revision of InterWave - AM78C201AKC and TEA6330T fader. Produced by STB Systems. STB Systems Soundrage 32 (InterWave) - standard InterWave card missing SIMM slots and IDE interface. There was "Pro" variant with 512 kB RAM. AM78C201KC chip. Core Dynamics DYNASonix 3D/PRO (InterWave) - features additional DSP chip that offered a graphic equalizer and additional sound FX presets. Philips PCA761AW (InterWave) - card design closely resembles the "AMD InterWave OEM Design" prototype. Has a footprint for 512kb RAM, often left unpopulated. AM78C201KC chip. Reveal WAVExtreme 32 (InterWave) - AM78C201KC based design. Comes without RAM and has no sockets/footprints to add any. As of February 2015 there have been efforts by hobbyists to produce a new InterWave based UltraSound compatible soundcard named ARGUS. GF1 The GF1 was co-developed by Advanced Gravis and Forte Technologies (creator of the VFX1 Headgear virtual reality helmet) and produced by Integrated Circuit Systems under the ICS11614 moniker. The chip was actually derived from the Ensoniq OTTO (ES5506) chip, a next-generation version of the music-synthesizer chip found in the Ensoniq VFX and its successors. The GF1 is purely a sample-based synthesis chip with the polyphony of 32 oscillators, so it can mix up to 32 mono PCM samples or 16 stereo samples entirely in hardware. The chip has no built-in codec, so the sounds must be downloaded to onboard RAM prior to playback. Sound compression algorithms such as IMA ADPCM are not supported, so compressed samples must be decompressed prior to loading. The sound quality of the GF1 is not constant and depends on the selected level of polyphony. A CD-quality 44.1 kHz sample rate is maintainable with up to 14-voice polyphony; the sample rate progressively deteriorates until 19.2 kHz at the maximum of 32-voice polyphony. The polyphony level is software-programmable, so the programmer can choose the appropriate value to best match the application. Advanced sound effects such as reverberation and chorus are not supported in hardware. However, software simulation is possible; a basic "echo" effect can be simulated with additional tracks, and some trackers can program effects using additional hardware voices as accumulators. Sample RAM The UltraSound offers MIDI playback by loading instrument patches into adapter RAM located on the card, not unlike how instruments are stored in ROM on other sample-based cards (marketed as "wavetable" cards). The card comes with a