Änderungen

You need Arduino to compile this and you need to [https://learn.adafruit.com/adafruit-trinket-m0-circuitpython-arduino/arduino-ide-setup install the components needed to use the Adafruit Trinket M0] in Arduino as well as the extra-libraries in the beginning of the source code using the Library Manager of Arduino. I disliked that my self-build Midi-Devices showed up all with the default Adafruit name, so I changed the name. This needs patching of an Arduino internal file - see the header of the source-code how to do that.