Just picked up a fretless 6-string whos preamp has been deactivated. Previous owners felt it was too noisy. Opening up the contraol cavity the pre looks like a real cheapie...plus there's no obvious was to hook it back up to evaluate it myself. Anyway, the upshot is that both soapbar pups and a piezo under the bridge have been wired straight to the jack. I'd love to simply wire the whole thing passive V-V-V-T but...I know piezos typically don't sound like much without a buffer pre. Any suggestions from the experts?