Although this is a guitar-inspired question, it is something I should know about. And yes, I did a search. I was over at my bandmate's house (he's a Rhythm Guitarist), and we were checking out his new amp, a 350 watt peavey (all those watts wasted on a single 12"... at least there's room for extension.) Built into it is an effects loop. Now as a common practice, he uses our other guitarists Digitech RP50 to switch between Clean and Overdriven, with some other effects. Since the Peavey had an effects loop section (with effects in/out jacks), I thought it would fit into this fine. So we plugged the effects out into the in jack on the digitech, and the effects in into the out jack, and plugged the guitar straight into the amp. Turn on the amp, no sound. Absolutely nothing. We tried switching channels (its a 2-channel) and still got nothing. Is my understanding of effects loops just wrong? How are they SUPPOSED to work?