Originally posted by: ADigitalMan
You'll have to rip the audio file from the DVD (.ac3 or .wav depending on the source), then convert the file to .wav if necessary, then cut out the bits you want, then re-encode to your desired format if it isn't .wav.

My recommendation:
DVD Decrypter for ripping
Womble MPEG Video Wizard for converting .ac3 to .wav (open the file, export it, changing the audio settings to .wav format)
SoundForge or Vegas for editing and saving into whatever format.

Thanks!

So, is there any way to cut up the .ac3 file before .wav encoding? I just can't imagine how enormous a full soundtrack .wav would be.

And is there any way to grab the selection while the DVD is playing (for sight reference), or is it really just something I need to buckle down and do the way you've suggested?

I appreciate your help. Thanks again!