Update
I'm glad you got it working!
@VladoPortos said in USB Audio dongle have no sound in emulators.:
I personally thinks maybe its something with retroarch, I'm trying now specify correct HW in /opt/retropie/configs/all/retroarch.cfg under audio_device = , but so far no luck :(
I agree, it sounds like it's just the RetroArch emulators without sound. I also think it might be a setting in /opt/retropie/configs/all/retroarch.cfg
RetroPie comes with a backup of their custom all retroarch.cfg with default settings. It is located here:
/opt/retropie/configs/all/retroarch.cfg.rp-dist
You could test with default settings by backing up your original retroarch.cfg and then copy retroarch.cfg.rp-dist to retroarch.cfg.