When I saw Martin Carthy play a few years back he has some sort of condenser mike hanging from the soundhole in his Martin guitar. Great sound!! so I asked him what it was. He said a $50.00 Radio Shack tie clip condenser mike -uses it's own little battery and was not plugged into any pre-amp. I was surprised to say the least and I went out and bought one. I play banjo and I can slip this mike easily on the tailpiece, plug it into a switchbox tuner, and right into the D.I. or sound board. After e.q./sound check -it sounds really quite good and quite natural on its own, or in combination with a regular mike, and the tuner works great with this mike too, which is so important for us hard done banjo players. Rick Fielding once told me that the technology is the same in this mike as the more expensive condenser mikes on the market. Anybody know about this?