Hi Andrew,
I saw you modified the Audio tab of winecfg to let the user choose a device. You're really doing a great job considering the mess behind it (audio architecture & drivers).
I tested the latest wine and noticed that when you click the "Test Sound" button, there is no error but if you do it again (or several times), there is a err:winmm:WINMM_OpenDevice Activate failed: 80004005 on the console.
Harmless but probably worth fixing.