https://bugs.winehq.org/show_bug.cgi?id=38536
--- Comment #6 from Paul Bredbury brebs@sent.com --- (In reply to Andrew Eikum from comment #4)
I've just sent a patch to default to Stereo configuration if we aren't certain of the true number of speakers.
I see it - https://www.winehq.org/pipermail/wine-patches/2015-May/139270.html
I've just tried your patch in Wine 1.7.43 - has no effect on my commentary voice quietness issue, although of course I've already selected Stereo in winecfg.