http://bugs.winehq.org/show_bug.cgi?id=11764
--- Comment #31 from Raymond superquad.vortex2@gmail.com 2011-01-07 00:42:55 CST --- (In reply to comment #2)
Amazingly this bug doesn't seem to have been filed before (support request for multi-channel audio) so correcting the details to make more sense. This isn't likely to be done for a while thought due to a) drivers not being that great, b) EAX missing entirely from drivers and other reasons which I'm sure the devs can give you.
http://connect.creativelabs.com/openal/OpenAL%20Wiki/Resources.aspx
There is Accelerated ALSA Library for Linux for emu10k1
and
Configuring Surround sound in Linux if you are using openal