This seems like a simple problem, but I can't for the life of me figure out how to do it in Vegas. I simply want to use a velocity envelope on an audio track. In theory, this should be simpler than doing it on a video track, especially if I'm willing to do it without preserving pitch. However, I can't find any indication that it's possible to either use a velocity envelope on audio, or use a velocity envelope on video and lock the audio so that it stretches with it.

With as many functions as Vegas has, it seems like this has to be possible.. But how?