Yes the RE20 is in the Reverb/Delay mode. The reverb in it just seemed to work for this song, but typically I use the Dr Scientist "Reverberator" for most of my reverbs. When my band took off I was mostly using the Boogies, a DC2 in Rehearsal, and my Fillmore 50 live, with very few pedals. But since I got the second cabinet for the Marshall I've been falling in love with it. And it requires me to have a pedal board. It sounds especially good with the Original Effects Revival Drive Custom. The "Custom" has special voicing controls that make it work with any good amp. And it wasn't until I really learned how to use those controls. that I got a great overdrive sound for the Marshall. It doesn't sound like a pedal, it just sounds like my amp getting progressively dirtier and slighter louder with each channel. And then the Red Witch Fuzz just takes it over the top for the leads. I am getting the best rock sounds I've ever gotten, and that's saying a lot. And I'm getting them with the least amount of dancing on the pedals.
As for the song, I'm excited to hear this with my band, but unfortunately I can't rehearse for a few weeks because I two skin cancers that needed surgery (face and arm), and I need the stitches to heal before I can rehearse! On the plus side they got all of the cancer:)