Hi Reg,
I'm not sure, but maybe this can help you.
I've created a chord looper tutorial to help the members of a dutch Genos facebook page. It's in the dutch language, but it's mostly a demo how to use it (i'm playing the song; While my guitar gently weeps) and the first minutes is just a short instruction how to set it up (which is really simple), so i guess that everyone can follow it with the instructions below:
Basically what i do here is adding the chord looper function to the home screen (on the assignable page) and use the Assignable E button for Loop start / stop and the Assignable F button for loop recording.
In the demo starting from 03:35 you see me recording the loop in realtime by pressing the Assignable F button and immediately loop it after that with the E button to keep the chord progression looping.
My guess is that with this info the screens in the video are more then enough to set it up yourself.
Chord looper tutorial (dutch)
https://www.youtube.com/watch?v=XepzyOuvv7A