Line 6 Floorboard:   ONLY Compatible with: AX212, 1st Generation POD/BassPOD, POD Pro (labeled "Pedal" above Cat 5 Connector"), 1st Generation of Spider (Red Faced) Flextone 1, Flextone II, Flextone HD.   FB4:   ONLY Compatible with: AX212, 1st Generation POD/BassPOD (labeled "Pedal" above Cat 5 Connector"), 1st Generation of Spider (Red Faced) Flextone 1, Flextone II, Flextone HD.   FBV4:   Works With: Flextone III, Vetta, Vetta II, HD1