Yes, sounds.vol
My personal way of extracting stuff from .vols is using the mapper to extract one file at a time (because it crashes on multiple file extraction). There's also a VOL extractor, but I don't know much about it.
Also, with my less than 1-month old external hard now dead, I have no access to any of my Outpost 2 resources, so I won't be able to extract anything for you.