I have a Line 6 GX and an FPV Mk II pedal 4 swiltched and 1 pedal.
I have them connected via USB to my iMac.
No LED's light on the pedalboard, except for the Wah/Volume
No tuner... no led's on the 4 footswitches.
What am I missing here??????
What are you trying to control with the FBV? It is a controller pedal, which you can either use to control a Line 6 amp, or with MIDI control, software like PodFarm.