Okay, here's the problem: I have three main basses I love to use, and I tend to switch between them often during shows. The problem is that each one has a very different output level. I have 2 matched up pretty well now, thanks to trim pots. However, one bass, my favorite, has a much lower output than the other 2. I'm looking for a good tool (pedal, DI, etc.) that would give me multiple preset levels that I could switch between. Any ideas? Basically, I just want to balance the output levels of my three main basses so that I'm not adjust my head's input gain every time I switch instruments.