I have feedback issues with my resonator bass (with magnetic pickup). I have been thinking of getting a 5-string acoustic, but fear huge feedback nightmares (with piezo) rather than little annoyances. So: a thought just this second popped into my head, and I wonder if any forumeer has tried it. I can't try it coz me reso has lots of little holes rather than one big one. What would happen if you shoved something like a towel or sheet into the soundbox of an ABG? Would this prevent feedback? Would it affect the sound so much it would sound rubbish? Am I a genius or an idiot? If anyone would like to test the theory and report back, I'd be grateful.