The music comes from the four stepper motors. These are usually found in robotics projects, as the degree, speed, and direction of rotation can all be controlled in software. The rotation creates noise; when controlled, the noise becomes a note, which the user can change using the capacitive touch keyboard. It’s quite simple, and all the more brilliant for that.
![The copper keys of this instrument are attached to two capacitive touch sensor breakout boards, which, in turn, tells the Adafruit Metro Mini how fast to spin the stepper motors](http://images.ctfassets.net/2lpsze4g694w/6qdmGbejEg0kaOJFObDsxr/4f647417f76893e6a2ab2bf8c268e9be/Screenshot_2024-01-03_at_17.09.31.png?w=800)