wow, what a refresher!
Wow. I needed a refresher. It's very decent yet not quite superb. I thought you meant sound "in general" not that it wasn't tutorialized. I personally get a bit confused by multiple references to unnamed generic objects. I felt a little bit of that confusion during your tutorial, but not on the whole. Most of your visual examples are good, yet some people, like myself, may benefit from additional example snapshots of the final timelines and stages. Great interactivity! Keep it comin'.