https://bugs.winehq.org/show_bug.cgi?id=37957
--- Comment #21 from hellas@burntcomma.com --- (In reply to mikachu from comment #19)
I have tried .37 now and it does work and fixes my issue. The dialog is a little confusing though so here's a note for people coming here to say it doesn't work: The "Device" dropdown doesn't select what device is the default or anything, it just selects for which device you want to change the surround/stereo setting. You have to select each device from the first dropdown in turn, and change each to Stereo in the second dropdown.
You're welcome