I've got a Line 6 Spider V 240HC with the matching 412 cab, and an FBV Express MKII foot controller. Im trying to figure out how to save certain amps to certain Letter Pedals. Like save cowboys from hell to a (or whichever) and save something clean, like acoustic rhythm, to another letter pedal, like b (or whichever) to where when im playing a show, i dont have to go back to my amp and switch from heavy to clean, especially when its quick changes in songs that cant be dragged out. Help is very much appreciated.