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... :
Whammy - DigiTech
Digitech Whammy DT pedale effetti per chitarra | Bax Music
WHAMMY 5 PITCH SHIFTING PEDAL WITH MIDI IN | Tom Lee Music