Hey everyone I´m going to try to build this: It´s going to be a A/B-box combined with a kind of looper. The A/B-box design is from fulltone´s webpage. The other thing is my idea. What I want with this box is to switch an effect in and out between the amps FX-loop and the guitar-pre-amp-effectchain. Do somebody her think it would work? I read somewhere that there is a chance that I will get pop-noise when switching the A/B is there a smart way to make sure I wouldnt get that? Besides, I have some trouble with the ground wire of the fx-loop and the pedal-ground (from the cables). What would be the best way to connect them? Like I did? Here is a file to try for yourself: Any thoughts?