@memeka not a lot for the moment.
i've compiled with pulseaudio, but i fall in the right issue i got last time. i don't remember exactly how i fixed, it to check this point.
I've tested some alsa configuration too without success.
i'm working on releasing the next version of batocera, without xu4 in a first time, i've some bugs to fix,
then, i will continue again on the xu4, i hope soon, before the end of january.