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video fx envelopes
how do i apply a Video FX envelope to a video track? for example, if i want to apply a black and white effect for a few seconds here and there only and the rest of the time keep the original video. is there a way to do that in the same way you adjust the composite level throughout by adjusting points on a line? does this have anything to do with keyframes? im having trouble with that. any newsletters on this topic? thanks.

