Jan Perschy's SGSX-H 750 is just what it looks like: a motorcycle engine with a keyboard attached.
As the teeth of the engine's gears travel at varying speeds past pick-ups that normally detect piston position, they generate tones that can be controlled with a keyboard. The third component, pictured to the left of the keyboard in the photo, is the voltage-controlled amplifier (VCA) that makes up for relative discrepancies in volume.
Perschy said his goal was to play the gears in a motor the same way that a Hammond organ plays its spinning tone wheels. The VCA module wasn't working when we made the recording below, an apparent victim of rough travel, but this was still a fascinating display.
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