http://bugs.winehq.org/show_bug.cgi?id=32277
--- Comment #7 from betaguy@gmail.com 2012-11-26 16:31:35 CST --- (In reply to comment #6)
Created attachment 42623 [details] winecoreaudio patch
This should fix it..
Confirmed, that does indeed fix it! I also tried testing an unpatched 1.5.18 with a 2-channel layout instead of 6 and it also worked, so it looks like your analysis was correct. Thanks!