I've discovered great fun in assembling guitar pedal effects kits. I had my first success with Ghost Driver from StewMac. The first attempt didn't work. but I got a free replacement to try again and it works fine. I'd like to get a schematic for Ghost Driver or Klon Centaur to help me troubleshoot the one that doesn't work. The failed unit has a lit power LED, makes a swooping sound when switched to a guitar, and has a clean go-through guitar sound when switched off.