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Gravis UltraSound
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{{Short description|Sound card for IBM PC compatibles}} {{refimprove|date=March 2016}} [[File:Gravis GF1.jpg|thumb|upright|The GF1 chip]] The '''Gravis UltraSound''' or '''GUS''' is a [[sound card]] for the [[IBM PC compatible]] [[system platform]], made by Canada-based [[Advanced Gravis Computer Technology]] Ltd. It was very popular in the [[demo scene|demoscene]] during the 1990s.{{Citation needed|date=November 2012}} The Gravis UltraSound was notable at the time of its 1992 launch for providing the IBM PC platform with [[sample-based synthesis|sample-based music synthesis]] technology (marketed as "[[Table-lookup synthesis|wavetable]]"), that is the ability to use real-world sound recordings rather than artificial computer-generated [[waveform]]s as the basis of a musical instrument. Samples of pianos or trumpets, for example, sound more like their real respective instruments.{{Citation needed|date=November 2012}} With up to 32 hardware audio channels, the GUS was notable{{Citation needed|date=November 2012}} for [[MIDI]] playback quality with a large set of [[Patch (synthesizer)|instrument patches]] that could be stored in its own [[Random Access Memory|RAM]]. The cards were all manufactured on red [[Printed circuit board|PCB]]s, similar to fellow Canadian company [[ATI Technologies|ATI]]. They were only a little more expensive than [[Creative Technology|Creative]] cards, undercutting many equivalent professional cards aimed at musicians by a huge margin.
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