The Bassbone is a two channel preamp with seperate volume, EQ, effects loop, boost circuit, tuner, 1/4" and balanced XLR out. Perfect for mixing two basses to one amp or straight to the PA so you can leave the amp at home. Visit http://www.tonebone.com/tbone-bassbone.htm for more info. I'm selling this because I've decided to use just a mic for most of my double bass gigs. US$160 + shipping, or best offer.