I use Vegas Pro 14.0 as well. I tend to use the MP4 video format, and my preferred audio format is MP3, but WAV will work, too. The audio for this one, though, is in the .ts format, which I'm not sure will work on Vegas, so I'd have to use Audacity for that file. Still, it works. It just takes a while to load because Audacity can be a bit slow with hour-long surround sound files, as was the case while I was getting ready to record Petrie. I opened the surround sound file and muted all the tracks except for the one that had the voices in it so that it'd be easier for me to listen in for those Petrie noises.
Oh, by the way, I can't whistle, so we'd probably have to keep the original whistle in with my spitting.