I'm not sure what I've got going on, but something funny is occurring. Since I need to get something up and running, I decided to duplicate some functionality on a new page rather than try to get the subcontrols working. I still am using a preset knob, though.
The preset knob has 5 subcontrols (what are also the subcontrols of a preset knob on a different page). When I try to store a value in the preset knob, I get the error message, "Preset knob has no sub controls.", even though the five controls are listed as subcontrols.
I am working across banks. The 5 subcontrols are all in a different bank. Is that a problem?