Today I tried out a cheap USB interface with my Reaper Pi, and it worked!

It was a noisy affair, but that's down to it being a rubbish interface. Next step is to try out another interface with a better quality input/output and go from there.

There is also a need to work on the footswitch underway, as a mouse and keyboard we're needed to get any kind of useful experience. Maybe trying VNC with a tablet will help.