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Motivation
Theremin is an electronic musical instrument controlled without physical contact by the performer (who is known as a thereminist). It is named after its inventor, Leon Theremin, who patented the device in 1928.
Theremin is a good old example that was reproduced in arduino using a distance sensor and a note (tone) selector.
This Modulino distance is incredibly precise and works very good for this task.
Using the encoder you can select each note, that can be take a different pitch.
BoM