I'm wondering if the PreSonus AudioBox iOne or iTwo, would work with Prime and the Keith McMillian Softstep2. I also have the Line 6 FBV Express MkII. Would it work with any usb midi controller? Could i use the Midi ports on any usb audio interface with the M-Audio Uno to connect a foot controller? Just looking at some different options with hardware I currently have access to.