In our band, both guitarists double on keyboards, and one plays harmonica and both sing. That's fun right? I want to add a baritone guitar to the mix, at least for a song or two, and I want to play the baritone, not have one of the other guys play it. So, one of the guitar players will need to play bass for those songs where I play the baritone, and has agreed to do that. But sheesh, we already have too much equipment on stage (5-piece band). Two keyboards, several guitars, etc. Even the lead singer has a pretty extensive percussion setup and sometimes plays a mandolin on one song. Now I'll be adding yet another guitar and amp. And I don't want to run the baritone direct to the board. I want to run it through a good tube amp with tremolo and reverb like a Deluxe Reverb (reissue), so that could mean another mic dedicated for the amp, etc etc. When does it all get to be too much? LOL And what instruments do you all double on or want to double on?