I'm chromakeying video track 3 onto track 2. I want to hide (not use) track 3 at certain times. How do I make track 3 so that it is not rendered for some period of time?
If I understand your question, you would have to split your events at the desired points and drop the opacities to zero, or else drag your other events up to overlay. Vegas Movie Studio does not have opacity envelopes like Vegas Pro.