http://bugs.winehq.org/show_bug.cgi?id=13046
--- Comment #29 from Raymond superquad.vortex2@gmail.com 2010-10-14 07:19:24 CDT --- Setformat
The method succeeds even if the hardware does not support the requested format; DirectSound sets the buffer to the closest supported format. To determine whether this has happened, an application can call the GetFormat method for the primary buffer and compare the result with the format that was requested with the SetFormat method.
The point is whether winealsa.drv can set the buffer to the closest supported format.
It is not clear that which is the closest