[Heinkel-162]

So I'm trying to turn up the volume and tweak some of the gun sounds, but can't seem to find them.

Ok, so I've had this problem as well, but I am not finding Files/Samples/xx.wav

All I have inside the FILES folder is

(folders)
com
gui
i18n
maps
missions

and then a bunch of randomly named "files" with no associations

You need an sfs extractor from the tools section:
viewtopic.php?f=31&t=2268
Use that program to extract the sounds from the sfs archives.