This calculator is awesome! Will definitely refer back to this. I'm gearing up to program my MIDI controller to be able to control the Kemper Player Level III Looper, which will require NRPN mapping. So this looks super helpful!
I have documented how I'm controlling the looper in the Kemper Profiler Player (Level III) with the XSONIC AIRSTEP here:
Kemper Profiler Player with XSONIC AIRSTEP - Bose Portable PA Encyclopedia
I hope that helps you.