Im looking for a Rack Preamp with Compressor, possibly with up to three inputs, so that I can plug in my freted, fretless and upright and switch between them as needed. Any Suggestions? I can get the tonal properties I desire from either my LMIII or SVT 5 pro. I guess Im looking a a quick and easy way of switching between the three different impedences of the instrument outputs on the fly. I have been using my Mackie board to do this, but I can hear the color differences between using the board, and plugging into the amps, plus the board is not rackable. Is there a Rack preamp/processor/multieffect that has a good compressor that I could just make different patches/banks for the different instruments. Im using a Line 6 floor pod, and it sort of does what I want, but is very limited. I want more bells and whistles.