I've never had the chance to play with a feedback loop before. I don't know if you've seen my board, but I have almost everything in the loop so when I hit the feedback button, it goes mental! with the feedback on, using step phaser on my zoom, I can make some really rythmic sounds, using my wah probe I can pitch shift, using digital delay just goes crazy, whammy and octaver are very cool and make computer type noises. All in all, it's really fun for f*cking about at the start, middle, and end of a set!