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Bono and The Edge onstage on U2's current 360° Tour (© A3464 Rainer Jensen/dpa/Corbis)

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Let's talk about delay. I noticed that when you guys played City Of Blinding Lights there was that unique delay to the guitar sound, even in an empty stadium. Do you still have the delays set to 3/16ths?

"No. We have new tempos in the show. I would say that 80 percent of the echoes of the show, Edge is still using his own Korg SDDs 2000s, which have to be manually bumped up. You have to go through them to get the right settings. And you can't go down, you have to go up. So you have to go 5, 6, 7, 8, 9 and so on to get to 4. Pride, With Or Without You, Streets - I know what number he wants and I have to change the settings manually. But sometimes the tempos do change, so I have to have it all written down."

And I see that there's no monitors on the stage - is Edge hearing his guitar sound through his earphones?

"Yep. Through his phones and what's coming from behind him. I don't want to say it's a compromise, but it's something he's still getting used to. What's funny is, the sound has been remarkably consistent. From what Edge hears on stage and from what the audience hears way out there, there's no bouncing around of sound."

Let's talk about some of guitars Edge uses on tour. You have a veritable guitar shop you bring around with you.

[laughs] "We do bring a lot, yes. I should be stringing guitars right now, in fact. C'mon, let's go downstairs."

Edge's '75 Les Paul? No, just an incredible re-creation. Photo: Joe Bosso

We take the stairs down to Dallas's cramped work area, filled with electronic gear and lined with guitars hanging from racks.

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