MrBook has shared documentation on his awesome hack to add MIDI to the Gakken SX-150 synthesizer. Here’s what you’ll need to turn the Gakken SX-150 into a MIDI synthesizer: Gakken SX-150 Analog Synthesizer Kit Arduino (This one is the classic, but my favorite ones, are the ones from Modern Device) MCP4921 12-bit DAC 4N28 Optoisolator… Read More Gakken SX-150 Synth MIDI Mod