I am thinking about buying the BP 100 Fishman transducer for my upright bass. A preamp is recommended. Does anyone here think it's possible to use a compact mixer such as the Behringer UB 502 5 channel mixer for a preamp? I am a complete novice when it comes to this sort of thing, but the mixer is about half the price of a preamp. Plus, I could run my electric bass through one of the channels and when I change basses for different songs it would already be hooked up and ready to go. All I would have to do is turn the volume down on the upright, lay it down, grab the electric and turn it up. Any insight would be appreciated. Thanks.