I never got the chance to chime in on this design-in-progress, but my reply would've been nearly identical to nickrose / Eventide's conclusions. Very versatile, and well thought out.
The only small item that hit me was the exclusion of Aux switch control. Non-essential, for the most part. But if the Aux Switches had the same treatment as KB0-KB9 control [MIN VAL and MAX VAL], they could be used to toggle between two preset InSwell / OutSwell level values. Just a thought.
