The Arcade Synth Controller uses a Feather M4 running a fork of the PJRC Audio Library code for on-board synthesis. Arpeggios courtesy of Todbot Arpy class. Four LED Arcade Button 1x4 breakout boards drive the 16 buttons over I2C. Also sends USB MIDI and classic DIN-5 (or TRS) MIDI. John Park's Learn Guide https://learn.adafruit.com/arcade-synth-controller
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