After some probing around the test pads while playing with the keyboard’s sustain pedal, [adriangin] found what looked like a MIDI signal between two ICs, but at a non-standard bitrate.

[forrest] passed along this diy foot-pedal ‘midi’ controller. It’s a good re-use of hardware, but not a true midi controller. The pcb was gutted from an old keyboard, and the pedals were ...