I'm using 2.3.0-beta (build 2.3 r7960), I ran a search on my system for anything "mixxx.log" and funny enough I found one that was updated today at this path:
~/Library/Containers/org.mixxx.mixxx/Data/Library/Application\ Support/Mixxx/mixxx.log
This one has the SoundManager error you're looking for:
I'm using 2.3.0-beta (build 2.3 r7960), I ran a search on my system for anything "mixxx.log" and funny enough I found one that was updated today at this path:
~/Library/ Containers/ org.mixxx. mixxx/Data/ Library/ Application\ Support/ Mixxx/mixxx. log
This one has the SoundManager error you're looking for: