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 an electric bass and double bass pickup 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.