Fbv Express Mk 2 With Amplifi 75 in FBV Controllers (MKI / MKII / 3) Posted April 24, 2015 Having similar problems. Mine worked for last year. Now it will only change channels ABCD on bank one. Even when manually changing banks as soon as u push on ABCD it goes to Bank one every time. Must be from update. As has always worked. And yes mine is slow now to change.