If you just wanted to know the answer given - fine. But, what is it you want to achieve? Faster sounding Audio? I'm interested to hear what you wish to do. There may be other solutions.
Yes, yes it would be! What a great idea. Obviously the Ctrl stretch does this, but for the WHOLE event, so not the variation. Hmmm... must be a way . .?
Well, in fact, it can be done, but not by Vegas alone. You need Sound Forge too. Sound Forge has an effect named Pitch Bend which does for audio what a velocity envelope does for video. You could open the audio in Sound Forge, apply Pitch Bend, and then import it back into Vegas.
That being said, there is no way to get the same envelope in both programs. You would have to do a lot of trial and error and outright guessing to get the audio to even come close to syncing with the video.
Well, start off by keeping them the same length. This may be difficult if you've already done some splicin'. I also run my audio through Cool Edit Pro 2 BEFORE I edit anything in Vegas.