Just finished this umble, pedal works, sounds great, but the led won't light up when on. Tried a second led, same problem. Took it out of the box just in case it was grounding out, but it's in a plastic bezel. Still won't light up. I can run an alligator clips of both a node and cathode legs and it will light up another led from the one in the circuit. This has got me a little baffled. Any ideas anyone?