Pretty neat layout.
The issue is in the supercontrol / subcontrol "tree" arraignment. There are times we do not allow a subcontrol to back drive a supercontrol:
- When a supercontrol has multiple subs (exception being a button "group" under a variable master)
- When a supercontrol has a combination of a button group and knobs, the knobs do not back drive <- this is your issue
These can backdrive a supercontrol
- a button group
- a single subcontrol
There may be a way to rearchitect the supercontrol/subcontrol relationship to get your desired result, but may take some thinking.