Hi Peter, thank you for taking the time to answer my problem.
I am not a MIDI expert, and I tried to configure KB Maestro in Audio MIDI setup, but I'm probably doing something wrong because I can't make it work. I checked with MIDI Monitor, KB Maestro does send the midi packets on the right channel but it doesn't seem to get to the controller. It's also very possible that I don't understand how to send the values properly to my controller.
It's not very important though, so I'm putting this aside for the time being.