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  1. M

    MIDI wont work on teensy, works on arduino?

    I can confirm, I had the same issue and fixed this by using a larger resistor between the 6N138 and the teensy RX pin. I had a 220 which worked for the arduino, but was not working for the teensy 3.2. When I replaced the 220 with a 470 I got a clear signal from the midi input.