Line6 FBV Express mkii @shroprockdoctor running the calibration setup, the 7 tuner LEDs indicating treadle position. #guitarfx #guitar #rackeffects #guitarpedals #homerecordingstudio #guitarrepair #hugeracksinc #bridgnorthbusiness #shropshire #audiorepair #audiorecording #basseffects #behringer #tcelectronic #eventide #peavey #alesis #korg #line6 #line6spider #line6amps #line6pod View this post on Facebook