https://bugs.winehq.org/show_bug.cgi?id=40203
--- Comment #6 from Andrew Eikum aeikum@codeweavers.com --- (In reply to Engys from comment #5)
(In reply to Andrew Eikum from comment #4)
I'm using the Reaper v5.1 demo and WASAPI works with winepulse for me. Is upgrading an option? If not, can you upload a log with the channels from http://wiki.winehq.org/Sound?
I can also start Reaper with WASAPI on Pulseaudio in shared mode but it sounds horrible -> all over crackling.
That's bug 39814 which may be fixed in wine-git.