Race, I'm a noob in age-building, but since I'm too working with sounds right now, I thaught I could answer

You have to excuse me if I've misunderstood your question and if you've already tried what I suggest.
I suggest you go and take a look at GoMa forum, there are a couple of threads which deal with this matters. I'd guess you've already checked the wiki here, but in the thread on GoMa forum there are questions and answers too, which maybe can spread some light over the issue:
http://www.guildofmaintainers.org/Forum/viewforum.php?f=77. Also, if you've not done that already, look in your gamesettings - audio (when you're in the game) and try to change things there.