When pressed on such matters, I've seen the band just get uncomfortable and side-step the full question, in the past. I've heard Bono say stuff like, "Well, we put on the best show we can. We know that's what our fans want, so we do all we can to be the best act out there," and other such hooey.
They can claim up and down that it's Edge's guitar, but they're lying scum if they do so. Obviously not live; during the tour, it may actually be played live, but not by The Edge or Bono or Larry or Adam. The band sometimes uses extra musicians under the stage. Look closely and you can actually see them--"they," by the way, are (as far as I know) always keyboard-players. They always do that stuff. I think it's kinda' shitty, but I'll live. "Bad's" my favorite U2 song and that's used a sequencer for about 20 years, now--it's disappointing, but (unfortunately) something the band seems to feel is a necessary evil.