@machuichan If the problem were an incompatibility with the video card, there would not be much to do, BUT, from what you are describing, I do not believe that it is.
See if any of these topics help you:

https://forum.recalbox.com/topic/22796/after-4-reboots-not-audio-working https://forum.recalbox.com/topic/21453/recalbox-7-plus-de-son-en-hdmi-pc64 https://forum.recalbox.com/topic/22614/no-sound-over-hdmi