A fellow named Erik writes:
"Alright, this has bugged me since i first heard the song Ex lovers lover. Starting with the first chorus there seems to be a second voice with yours. Its kind of a deeper whisper in the background and is in all the choruses except the last. Was this a second vocal track? Just an echo? A second singer? Just a cool effect u felt like adding during editing? Did the devil himself sit in on that recording and felt like helping out?"
The answer is YES, there is a second vocal track and it is exactly as you describe it. And yes, it was the DEVIL. That's right, the DEVIL himself sings back-up on my album. Just kidding. It's just me. I thought that having a low, growled whisper in the background that was barely audible might add some menace to the track. I also felt it might seem like it was the "inside voice" of the song's narrator, like he's hearing himself think these terrible things in his head.