i've had a minor crises all night.
i noticed some clicks in the file, and went to rerender but it didn't null. after much freaking out, i eventually realized that there was a doubled bass part *muted* in the mix, and the mute was contributing this nice glossy blur on the bottom. i had removed the track, because it was muted anyways, and the gloss disappeared.
which means i'm actually taking advantage of the error in cubase this time, and trying to find a way to prevent it from saving correctly.
i think i've almost got it.
but that file will be replaced one more time, and i'll have an alternate mix or two up then, too.
it's clear that i need at least two singles, but less clear how to sequence them.