http://bugs.winehq.org/show_bug.cgi?id=29469
--- Comment #1 from philbradley@gmail.com 2011-12-28 17:28:14 CST --- Actually, just restarting pulseaudio, then rosetta stone, seems to sort it out.
This seems to be related to this issue: http://bugs.winehq.org/show_bug.cgi?id=27895
which in turns says most of the discussion is happening here: http://bugs.winehq.org/show_bug.cgi?id=28723 (mind you, I don't have winecfg set to Windows 7, but to Vista, though this behaviour was also common under windows xp mode)
supposedly a raft of audio bugfixes are on their way in the 1.3.36 - I hope that this will go away.