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Electromechanical musical instruments are ones that use a device activated by electricity to generate sound. Examples can include hammers that strike based off an electric signal or wheels that spin when activated. I prime example of a commonly used electromechanical tool is the stepper motor.
Some musical instrument makers who make complex use electromechanical parts-
Mark Applebaum
Erin Demastes
Alice Eldridge
Gijs Gieskes
Koka Nikoladze
Matthew Steinke
Tom Strum
Alan Tofigi