http://bugs.winehq.org/show_bug.cgi?id=11764
--- Comment #33 from Raymond superquad.vortex2@gmail.com 2011-01-07 20:59:02 CST --- That accelerated alsa driver for emu10k1 only provide stereo control of those hardware mixing volume controls provided by snd-emu10k1 similar to
http://git.alsa-project.org/?p=alsa-tools.git;a=blob;f=hwmixvolume/hwmixvolu...
It actually playback different openal mono source through different subdevices instead of mixing those mono sources by openal
That implementation is the basis if winealsa want to provide dsound hardware secondary buffers for ds3d
you will need to enhance the openal-alsa-emu10k1 to control the rear speakers since the volume of the rear speakers is controlled by another sets of "EMU10K1 PCM Volume" , "EMU10K1 PCM Send Route" and "EMU10K1 Send Volume" of the rear device