http://bugs.winehq.org/show_bug.cgi?id=31072
--- Comment #2 from sworddragon2@aol.com 2013-04-20 04:09:51 CDT --- The ingame NPC sound is still quite while the cinematics are loud. But it is difficult to say if this is really a bug (I have just the confirmation of somebody who said me that on Windows both sound types are normal).
The best would be if somebody who has Linux and Windows could test if there is a big difference on both sound types.