1. Experimentation seems to indicate that when there are multiple video tracks that are running at the same time on the timeline, the track on the bottom takes precedence. That is, it is the track that will be visible. Is that correct?
2. Why would anyone want to use more than one video track? For instance, why would a person use, say, 5 video tracks. What can be accomplished using 5 tracks that could not be accomplished using one track.