Yes.
I’ve tried the following configurations:
Use Expression Pedal, Aux Switch, or Both is set to Both
Aux Switch Mappings: Performance Switch set to Foot Switch 2 (Ring)
Alternatively, tried Aux Switch Mappings: Tap Tempo set to Foot Switch 2 (Ring).
Expression pedal worked but switch had no effect.
Tried above configurations on another H9 device. Even tried after a factory reset. Tried a different TRS cable. Same result.
Tried a Mission Engineering Line 6 pedal (connected to the H9 with an insert cable). Same result.
