The effects loop causes my quest II preamp makes a ticking sound (about 5 times a second) if a cable is plugged into the 'send' jack. It does this even if I just use a cable in the loop with no effects, even if I don't plug the 'return' end of the cable in, and even if the amp is muted. Epifani say that it's a design fault and that there's nothing I can do about it. I'd still like to fix it, anyone got any tips on what a fix would entail? A circuit diagram for my local repair guru would be great too. TIA.