via this auction
"THE MOTOR SYNTH IS AN ANALOG, ELECTRO-MECHANICAL SYNTHESIZER THAT USES EIGHT BRUSHLESS DC ELECTROMOTORS AS OSCILLATORS.Electromotors have never been used as the principal sound source for a professional musical instrument until now – nothing like this has ever been built before.
The MOTOR Synth produces sounds by accelerating and decelerating eight electromotors to the precise rpm (revolutions per minute) that correspond with specific musical notes. The instrument’s 8x-motor & 2x-filter configuration makes it a four-note paraphonic synth with two voices per musical key.
THE MOTOR SYNTH HAS TWO WAYS OF PRODUCING IT’S CORE SOUND:
Firstly, magnetic pickups are placed on each of the eight electromotors; the spinning coils result in a very industrial-sounding, purely analog tone. Think eight harmonious revving engines pumping out sound.
Secondly, specially designed reflective optical disks have been attached to the shafts of each electromotor. Each disk contains a graphical representation of three standard audio wave-shapes. As the electromotors gain speed, the disks start spinning and each wave-shape is read by a dedicated set of infrared sensors. The moving wave-shapes are then converted into audio signals. Thus, the wave-shapes on the reflective optical disks become precise musical notes, corresponding to the speed of the electromotors."
You can find demos of the Motor Synth in previous posts here.
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