In terms of the wierd sound, it may be to do with proximity to anti-sub nets (i think that's the cause anyway) at least, this sometimes happens when loading a savegame - the sound really is awful! (it seems to appear in all versions of the game, but only quite rarely) So it might be a good idea to always keep your headphones low until everything's loaded - just in case.
Enjoy GWX, the game is improved 100%!
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