Thanks, I got this to work for one control. The scenario is really more complicated (got into trouble in my next step); what I want to achieve visually is the following:
One selector for a CC data value to mean a preset on an external effect
One button to load the preset, CC=118, data from the selector
One button to store the preset, CC=117, data from the selector
I've tried various configurations including chains of hidden dummy supercontrols but can't seem to find a solution.