I built a pedal that turns my whammy pedal into an arpeggiator by sending MIDI to it! Would anyone want one if I refined it and built more? More info in comments... :
Molten MIDI 2
Whammy - DigiTech
WPC – Whammy Program Changer | effettidiclara
Digitech Whammy 5 Pitch Shifting Pedal With MIDI In. – Maar's Music