http://bugs.winehq.org/show_bug.cgi?id=11764
--- Comment #39 from Raymond superquad.vortex2@gmail.com 2011-01-08 23:48:56 CST --- To enhance the multi channels support of winealsa
you also need to enhance the mixer.c to add those "Front", "surround" , "center" , "lfe" and "side" playback volume controls
Take a look at the output
WINETEST_INTERACTIVE=1 wine winmm_test mixer