How can a host detect if a plugin supports poly aftertouch?
A host needs to know this in order to be able to come up with a ChCtrlList resource for MIDI 2.0 Property Exchange.
There’s no way to find out if kPolyPressureEvent is supported, or is there?
There’s kCtrlPolyPressure, but that’s supposed to be used with LegacyMIDICCOutEvent only I think.
Perhaps IMidiMapping can be abused for this (“id == 0” could mean “no poly aftertouch”, for example).