So I've been using guitar/amp modellers for nearly 20 years now - right back to the Roland VG-8 in 1998. In all that time I've been through many, many different expression pedals. All of them have their quirks, but they usually get the job done after a bit of set up.   When I got my Helix Rack & Control last year, I decided to treat it to some new expression pedals, so I bought 2 FV-500Ls and an FV-500H. I wanted something rugged for realtime control of both the Helix and Ableton Live. I h