get the Midi info
From my quick glance at it it looks like you can use sysex to control the MPX1.
It looks like everything can be controlled, but unfortunately I don't have one to play with, so I can't say for sure.
One thing though, you will need to break the encoder / button values up into 4bit blocks (called 'nibbles' - half a byte. Get it? These computer guys - what a laugh.)
The BC does it with the word val0.3 for bits 0 to 3 and val4.7 for bits 4 to 7.
Best of luck
Royce