I've been thinking alot about feedback and how to make it more accessible and controllable. Remembering piezo buzzers, I was thinking that if, somehow, I could get the guitars sound going straight back into the pickup through some kind of a minispeaker in the actual guitar, what would happen? I came across this: http://store.guitarfetish.com/on25waguamdr.html And was wondering if by combining the onboard miniguitar amp with a small, small speaker under (or just close) to the pickup would have any work/lasting effect on the guitar and its feedback. Anyone have any thoughts? I'd like to hear the wisdom of this forum before I drop a whole $20.