The grey 20-pin wire is used on the Ghost Trap Pedal. The wire connects from the Hammond Plastic 1591L Project Box to the Grey D-Sub Housing across the front of the pedal. It can easily be found on many older computers. The correct one is grey with one red wire on the side; it's a standard ST-506 20-pin data cable, seen here:
The grey 20-pin wire is used on the Ghost Trap Pedal. The wire connects from the