"Yeah. I started using them [SDD-3000s] shortly after first working with Edge on The Unforgettable Fire. Basically, I stole his sound. It wasn't a complicated rig: just a guitar he liked through a Korg SDD-3000 digital delay into a Vox. Three components, mono - that's it. The great thing about the Korgs is its three-position level switch, which lets you hit the amp with about 10 extra dB. It's more overdriven than if you just plugged the guitar straight into the amp, even when it's on bypass. But a lot of the guitar sounds on Achtung Baby were recorded through a Korg A3 effects processor."