I am relatively new to Vegas Video, and would like to have some advice from some of you old-timers. I am putting together a video, which is in essence a composite of 15 stills, a book called "The Spyglass", audio narration and a music bed. What I have seen done is as the story is being told, you can see fading through the stills, video clips that help to accentuate the story being told. What I need to do is to accurately control the opacity of the "stills" track so that say, 10 seconds into the still, I start to let the video show through, then, I gradually return to full opacity on the stills before fading to the next still. I am fairly familiar with track envelopes in audio. Would this be the way to do this? Thanks in advance for any advice you can give.