I have a GK-RB700. I've been getting more into pedals and have been using them with fantastic results. A couple days ago I go to practice at a studio my guitar player rented. I wanted to bring a fuzz but forgot it so he gave me a boss mega distor. I plug it in with a 9V boss adapter I switch it on, sweet distorted goodness! I turn it off, adjust the pots switch it back on....and nothing. I press it a few more time on and off but the only sound I get is a high pitched whine in between the nothing. When the pedal is off my clean tone works just fine. We practice without it and my worry is mild. Fast forward to last night. I bring my TAFM to a show for the first time. I've used this pedal with the same rig I was using for practice and it sounds awesome! I want to set the tone/volume for the room. Plug everything in switch it on....nothing. I switch them and find out very quickly that the "in" and "out" was set correctly. I give the pedal to my guitar player, works like a charm. I even try sending it through the effects loop and still nothing! What's going on here!??!!!?!?!