You're right -- that's from something called "compression" which is a technique I've noticed Murray is extremely fond of.
Essentially it fills out the music so that the whole piece is essentially at the same volume throughout. The more you turn it up, the more powerful the whole piece feels. It's funny, because all I really did in the new version is increase the compression a lot, and then Murray said "Oh yeah, that's sounding a lot more Gold!" (which made me laugh by the way). I joked with a friend before making any changes that all I would have to do is compress it as much as he compressed the album version and then he would love it.
It seems I was at least partly right!
