And since all the offboard wiring is making a few people say, "WTF," here's the rat's nest that is the offboard wiring for this effect. The "In" and "Out" wires go to the normal 3PDT switch you'd use for effect on/off.
This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.