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Type of Gravis Ultrasound to emulate.

classic : Original Gravis Ultrasound chipset
classic37 : Original Gravis Ultrasound with
                 ICS Mixer (rev 3.7)
max : Gravis Ultrasound MAX emulation
          (with CS4231 codec)
interwave : Gravis Ultrasound Plug & Play
                 (interwave)

Possible values: classic, classic37, max, interwave.
