I was playing an old Gretsch tenor banjo that I picked up years ago for $25 at a show last night, and I was using a cheap stick-it-on pick-up that I duct taped on to the body. I was going thru an Acoustic Image Corus amp, and the sound men at the park we were playing at saw the mic jack on the front of the amp, and said excitedly, 'All we need is an XLR!". They plugged a cord into the mic input, and i couldn't believe the difference in sound when I tested it out. Instead of the ratty, annoying, crappy sound the banjo usually got, it sounded like a $10K banjo, full, warm, strong and pretty, with a little click kind of sound every time I strummed a chord. My guitar was plugged in the other channel, and sounded the same way it usually sounded. I asked the head sound man why it sounded so great, and he said that he did a little something to give it a warmer sound. I told him it seemed to come out of only my amp, and he said I was probably hearing the back of the big speakers they used, and also some of the monitor that they set up for the vocalists. he also said it could only be as good as my amp was. I asked him how i could get a sound like that all the time, and he recommended a Fishman pick-up. What happened?