Got it - Mid output was set to NRPN not CC.
Boom!
Thanks Bin!
Ok thanks for persevering, I’ll add a note to the device page, I hope it’s useful. The behaviour of the Rytm when triggers by midi is a bit weird, all trigs sound, whatever the setting on the trig page. So you have to turn the gain down on synth if you just want a sample to play.
Hm. How would you midi map this?