How to get a delay tone — and 173 famous songs that use it, each with researched amp settings and gear you can adapt to your rig.
Dialing delay: Set delay TIME to the song's tempo (a dotted-eighth against the beat builds the rhythmic wall The Edge is famous for), FEEDBACK for how many repeats, and MIX to taste. Slapback = very short time, one or two repeats. Ambient = long time, high feedback, high mix.