Hello everyone I’m new to this so please forgive my novice question but our church has a behringer X32 and we have a p16 set up for musicians we have 3 of them ie: the drummer the keyboardist and the electric guitar for some reason all of a sudden the keyboard is not flashing on the p16 nor is there no sound coming through the p16 we can hear everything else except for the keyboard any pointers will be really helpful