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Here is my first attempt to use capacitive touch sensors to convert the Bucky Glow faces into keys of the musical instrument. I also demo the MIDI signal and audio signal of the Arduino. Audio signal needs some work because I need to buffer output and the sound is pretty gnarly.
My favorite MIDI library: https://www.pjrc.com/teensy/td_libs_MIDI.html
Great article on Arduino and audio signals: https://makezine.com/projects/make-35/advanced-arduino-sound-synthesis/