False alarm: I should’ve known better. I’ve run into this before.
Copying the HotSwitch values over to the expression pedal is no problem. Even after clearing the original HotSwitch map. pasting from the EXP PED – back into the listening HotSwitch – is the issue here.
Seems like the expression pedal takes precedence over all. It’s current low position becomes a range limit over the HotSwitch. I’ve gotten some mixed results, but nothing (yet) that effectively swapped the ‘A & B’ sides of the HotSwitch mapping.