Summer of 2010 I ran into Dallas at Guitar Center Hollywood. Amongst other topics, I told him about the Fractal Audio Axe FX.
I told him that I'd forward the info to him at Principle Management the following Monday.
Seems he was interested enough to check it out.
I've heard some in-ear monitor mixes from the S. American shows where Edge mentions Fractal during soundcheck. Seems he was A/B-ing sounds.
It also seems that it will be used, at least for smaller promo shows as one was in his rack for the Oct 15th, 2011 Clinton Decade of Difference show at the Hollywood Bowl.
Have a good look at this photo from the Clinton Decade of Difference. Look at the unit in the bottom of the rack. Big square green display.




Now look at the Axe FX II. (At the link below)

http://www.fractalaudio.com/





