Just be aware that in my experience with this it can sometimes take maybe 2-3 re-renderings for this to really start being effective (and sometimes if you do too many it actually starts to go away again), so be sure to output the good ones to audio before doing another re-render.
Also, and this is quite important: Never attempt this with "fast rendering" enabled, make sure that's turned OFF!


Just because you can, doesn't mean you should!
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BBox 2022 Audiophile, Mac Pro Intel, OSX 10.6.8, 800x600 (TV VGA)