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BackHagiwo's cheap arduino version and https://github.com/elkayem/midi2cv which it is if your 3PDT toggle switch, like mine, is a ceramic 104 power cap like C5, C6, C8 | 4 | 100 nF | Unpolarized capacitor | | C6, C7, C8, C9 Schottky Barrier Rectifier Diode, DO-41 D3, D4, D5, D8, D9, D10 100V 0.15A standard switching diode, DO-35"/>