“A deadly trick for gluing a mix together is to take a snippet of audio from the main riff or hook and make an ambient wash to place in the background.
"Just strap a good long reverb across the channel – a large plate or deep hall works really well – set the dry/wet mix to about 80% so there’s still a bit of the original in there and bounce it off.
“Import your new bounce and put it back on the same channel with the reverb. Apply a time-stretch and stretch it by about 200%. Then, reverse the stretched piece of audio and bounce it again, still going through the reverb. Repeat this until you have a glistening pad that’llprobably be a couple of minutes long. If you mix the new effect quite low behind the original dry sound, it gives a ghostly tail that’s much more interesting than a standard reverb.”