The latest releases disable USB-C audio.
I have a soundblaster DAC which worked in a former release.
When I plug it in, the audio output seems to be redirected (speakers are mute), but no sound comes from the DAC.
USB Player Pro works only on Android with the Playstore. I have had the app on my GS290 with /e/OS and the paid version did not work. I’ve mailed them and they confirmed it.