Quote:
Originally Posted by Rangler
I'm thinking some plugin saturation, maybe.
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I think most saturations are static. Some add low levels of noise, but that shouldn't account for enough difference to really notice.
Many algorithmic reverbs have modulation. Even when it's not obviously modulated and even if it has a modulation knob and you've turned it all the way down, there very often is some in there anyway. It's just how they work.
Another thing some people overlook is that most of the massively multisampled drum programs have some amount of humanization/randomization so that you get a different sample every time even when it's the same note number and velocity. That one has freaked me out in the past.
The one way to be completely sure is to render/freeze every track before rendering. Better yet is to either put something on your master to make sure that the variations can't cause clipping or render to a floating point file and then normalize to your desired target peak level and render again.