Went to Ratshack the other day and picked up a small electet condenser and $9 worth of other parts and made me a 9v mic. I've tried it on acoustic guitar and electric guitar so far and I like it. It definitely sounds cheaper than my other mics (but still better than a 57). For acoustic, it needs a fair amount of gain from the preamp, but only a moderate amount for electrics. Its kinda "sea change"y sounding, pretty mellow. I originally made it to see how it would do as an overhead, so maybe I'll get to that later. If I could figure out how to post clips I would, any suggestions?