I have some freestyle BMX video and sometimes you want to stop certain movement in an exact moment so I almost always create speed velocity curve with values 100 75 40 80 100 for the clip. But how do I keep audio in sync with the variably-speed-changing video?
You could export those sections of the audio to Sound Forge and play with Effects / Pitch / Bend, try to match them up somewhat closely, then bring them back into Vegas. The methodologies are different though so there's no easy way to duplicate the exact velocity change. It will take a lot of tweaking to get something close enough to be usable.