I'm having trouble with a pedal build. I just finished building this pedal http://tagboardeffects.blogspot.com/2012/06/devi-ever-ruby.html with this wiring diagram http://tagboardeffects.blogspot.com/2012/02/offboard-wiring.html I have built one pedal previously. It was a one knob no led, just battery fuzz pedal and it worked on the 1st try so i figured I'd try a 2 knob jobby. This pedal isn't working. I can hear my clean bass when bypassed but when I engage the effect the led comes on but no sound. Only thing I did different was add an extra ground wire onto the veroboard to run to the volume 1 lug. What would be the 1st thing to check? I have a volt meter I need to learn to use, i've only used it to find the resistor values.