jaumepedros:
I've Got the same problem when I put in front of GMajor Tc electronics the eventide H9.
The G Major gets no good changes of Rocktron midi Raider.
Well, for now I'd do what the post before yours suggested. Connect the H9 after the G Major with MIDI. The MIDI connection order doesn't matter, and if you've diagnosed the problem correctly, it should solve your problem.