Looks like you want an onboard solution. I can’t think of a way to do that in an H9. The most compact solution would be any kind of (external) momentary switch. A latching switch might be even better. Plug it in like an expression pedal. Any per-preset expression pedal mappings [KEY, MODE, DELAY GRP, …] can be switched between the “Heel” & “Toe” extremes.
