Gamechanger Audio Motor Synth - Superbooth 2019

Motor Synth produces sounds by accelerating and decelerating eight electromotors to precise rpm (revolutions per minute) that correspond with specific musical notes. The instrument’s eight-electromotor configuration makes it a four-note true polyphonic synth with two voices per key played. 

This is a new method of analogue audio signal generation, since controlled electromotors have never been used as the principal sound source for a commercial musical instrument, nothing like this has ever been built before!