TC Flashback Mini actually : ) But I did also cheat and use Native Instrument's Replika XT plugin for ping pong stereo interest.
I like to use delay rhythmically - I'm a fan of the dotted-8th.
The song sprung from the delay idea first and everything flowed from there. Currently working out with the other guitarist how we're gonna play it live.. who does the delay and who does the arpeggio rhythm.