Do you have a sequencer that you can record the mididata from the AXON,
then you can see if it transmits control changes like modulation (CC #1) and expression (CC #11). You could also look for pitchbend data incase that your AXON tries to fine tune the pitch according to the pitch changes of the guitar.
This is bassed on knowledge of the JV880 nut not the AXON.

Good luck