Found this ... does it help?
"... To assign a MIDI CC message to the Rotary parameter, you must have a controller on your keyboard that can be assigned to send MIDI CC# 75 - 87.
You can then assign one of these parameters to the Rotary parameter, depending on the Organ instrument sound you are using"
Everyone, and everything I listen to is my teacher. Every instrument, every voice, every sound in nature ... they are all my private tutor ... 24/7 for free.