I think he does use a single setting for it since its placed on top of one of his twin towers and not in front of him. And I don't see Edge doing a lot of fidling with it during the show. Its just that he only uses it for the old songs (Boy to War?) and something else for most others. And I have no clue what the setting is, I have the turbo version of that pedal and mostly use a Boss GX-700 these days.