I had this idea. Sometimes I need to switch between basses in my band, which means muting the amp and switching cables around. That's a pain. So what if . . . I plugged both basses into a mixer and ran one of the outs in mono to the amp? That way I could control gain on the mixer and use faders and mutes there to control volume, and never have to switch plugs around on the amp. Does anyone see any glaring technical problems with this setup?