I play upright in a couple bluegrass groups. I mostly play acoustic upright, but I also have an NS stick bass. Nobody else plugs in. No drums, etc. I currently have a GK MBS III combo amp. It's nice, but it's getting heavier as I grow older. I'm want to sell the GK and get either an Upshot or Double Shot. Which would work best for me? Is the Double Shot more than I would need? Using it mostly as a monitor, but AI says the Upshot provide enough sound for other musicians on the stage. Thoughts?