I wanted to play microtonal scales with my MIDI keyboards, so I made this arduino based device that reads in MIDI notes and sends out corresponding microtonal pitches using MIDI notes and pitchbend values. I wrote the code for n-TET microntonal scales, i.e., equally spaced whole number of notes per octave, but I think it could be easily adapted using a pair of lookup tables to map to any scale.
I relied heavily on this Send and Receive MIDI with Arduino instructable. I recommend becoming familiar with it.
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