I have just bought a Amplifi TT and FBV Express Mk11 and I am having problems with the FBV Express. When the FBV Express is plugged into the Amplifi TT the tuner lights flash for a couple of seconds and then there are no lights on the unit. I can use the A - D buttons to move between the tones and the expression pedal also works but the tuner doesn't. There are also no lights on next to the A - D buttons and the tweak lights are not on either. The tuner lights flash intermittently. I have updated the firmware for both the Amplifi TT and the FBV Express. Is this correct or should the lights work? Can anyone help?