Finally worked out what the problem was after eliminating everything, different cable routing etc. The item in my chain which was causing the problem was a morpheus droptune...bit bizzare. I don't often use it so its not switched on, so the signal is just passing through via the bypass. When I switched it on the distortion disappeared, thought it may have been my behringer amp switcher..very cheap unit but does the job or my morley volume pedal but elimated both of those. Lowering the output volume on certain patches does help also so thanks for that
