Well, as you mentioned, if you set PitchFactor to transmit all the MIDI messages it receives through to its MIDI output, it will still respond to program changes it receives from your external MIDI controller by loading presets but it will also pass those messages through to other devices in the chain. I think that would be the way to do this… Also, if your external MIDI controller let's you send multiple program change messages from one button, you could put other program change messages on a different MIDI channel and set PitchFactor to ignore that channel.
