midi_keyboard a hackable midi master keyboard the principles http://blog.komar.be/how-to-make-a-keyboard-the-matrix/ old 'Miditech MIDIPLUS-61' only using the 'keybed' + teensy 3.5 no velocity support, but you can find relative info. https://github.com/ast/keyboard/blob/master/README.md ast/keyboard#1 OSC over Serial added, and transmitting Serial over Bluetooth w/ HC-06 connecting PD patch added, depends on 'osc', 'comport', 'slip' etc.