Thank you for the logs @retroFuture, I’m sure they will be helpful at some point, but these are the Retroarch logs, it would be nice to see the audio logs instead:
Lakka documentation - Troubleshooting Lakka (under “Audio device logs”)
This will simply list the sound devices that have been detected by Linux. A simple comparison of this output between the stable and nightly Lakka versions would allow us to see if there’s anything wrong with the sound devices on the system level.
It would be helpful to see the outputs of the following commands:
aplay -L aplay -l dmesg lsmod
If the problem is related to the kernel, someone who owns an RPI 4 could help track down the problem by testing different kernel versions and see which one introduced the bug.