Thanks. To avoid changing the sound module (since it is in between the Keystation and the PX), I would need to have program changes sent on different MIDI channels, right? If so, I don't see any parameter that let's me change the channel the PX is listening on. So, I believe I would need to change the MIDI channel on the sound module, send program changes to the PX, then change the MIDI channel back to "1" on the sound module in order for the Keystation to control both the sound module and the PX. Does that sound about right?