Overview | Adafruit Feather M4 CAN Express | Adafruit Learning System
GitHub - arduino-libraries/MIDIUSB: A MIDI library over USB, based on PluggableUSB
JY MCU USB Bluetooth compatible wireless serial port transparent transmission module original HC06 host with housing 2.0|Parts & Accessories| - AliExpress
A new MIDI library - Look What I've Done - XOD Community
Make Your Own Cheap USB MIDI Controller or Keyboard : 4 Steps - Instructables
A new MIDI library - Look What I've Done - XOD Community
How to do USB MIDI?
Second iteration: USBmidi2 / Raspberry Pi Controller