I have used the Pro4 with MPE to successfully control a Deckards Dream but when I put the P6 on MPE (Global setting above midi channel 16) it doesn't respond when certain keys pressed on the Pro4. Varies by octave. The midi converter box of the Pro4 is blinking that midi is being sent, but the P6 doesn't make a sound with certain keys.
Changing to ALL midi channels, all the key presses are sounded but no x axis vibrato.
Not sure if Param Xmit and Rcv should be CC or otherwise.
?