Hi submikey, welcome.
About your sound issue, I have the same as discussed in this thread:
http://www.subsim.com/radioroom/showthread.php?t=109877
I have since tried upping the sounds levels and there's a faint hum in the background, drowned out by the loudness of the ticking clock :rotfl:. Funny thing for me is I never played the game without GWX so I've got nothing to compare this with, it just seems far too quiet.
Anyway, it's not a show-stopper so I'm just getting on with it, but like you I'd be intersted in how to fix it.