Hello simonegiusti.
I'm sorry you experience such bad issues....
I still need to understand what is going on here if you don't mind.
It would be very kind of you if you could take the time to contact our support and give us a little bit more of info.
For the Expression pedal i don't have the issue here, what is your pedal model? In which input is it plugged to?
For the sysex, can you explain excatly what you are trying to accomplish? so i can reproduce your setup?
Most of all, what happen during the show? can you give us more info on it?
Like i said, i'm very sorry it turned out that way for you, i wish to understand the issues here to have them fixed asap.
Waiting for your answer.
Kind regards.