Thanks a lot for your answer. I tryed different pedal and it was the same. So I changed cable and it works now also with my old pedal. Problem was in my snake cable. I have there power line for my pedalboard midi lines, switch lines for my head and also lines for expression. Probably voltage which goes trough the power lines make some electric noise in other cables and Eventide thinks that expression pedal is moving. As I said with separete cable it works fine. It´s sad but I must live with it.