Description
Now you've gotten the hang of the delay settings and rhythm. Let's talk about chord voicings.
The Edge uses a lot of 9th chords and Suspended 4ths. 9ths are also the 2nd scale degree. So in the key of A, you'd just add a B note on top of your A Major chord. It gives the chord a wider sound, with some beautiful dissonance. Essentially, you're using a dissonant melody note on top of your chord, high enough that it doesn't clash with the root. In this context it really sounds pretty. It's a perfect example of the paradox of harmony.
To get a Suspended 4th, just take the 3rd of a major chord and raise it up a half step. This comes from old church music (as most western music does), and makes for a big otherworldly, ethereal sound. The trick with this is to raise it up (suspending it) and then bringing it back down, resolving it. It's that "Amen" sound you might have heard played on an organ at some point.
These can be moved up and down the neck - the higher you go, the more pretty and harp-like they will sound. Try it!