This allowed [JenShen] to scan the keyboard matrix with an Arduino and generate MIDI notes and send them to other synths. In the video after the break, you can check out [JenShen]’s circuit and ...

[Furrtek] sniffed out how the touchpad ... an ATtiny2313 as the core of a circuit that spoofs those signals. The microcontroller now listens for incoming MIDI data, looks up the proper signal ...