http://bugs.winehq.org/show_bug.cgi?id=57936
--- Comment #2 from Wiktor Grebla greblus@gmail.com --- Allright, after some further tests it turned out that the *level in AEV_GetMasterVolumeLevelScalar() stub has to be set to 0.7 (Yousician's latency calibration requires 70% or less) and calibration is working correctly so I can use Yousician with my bluetooth speaker :)
I don't know if it's acceptable, but changing it upstream would certainly make my life easier :). Until then I'll be overwriting /usr/lib/wine/x86_64-windows/mmdevapi.dll with my modified version after each update of wine.
And BTW - thanks to all of you guys for making wine so great, It's one of the most amazing examples of technology I've seen in my life :)