Had CentOS running KVM/QEMU, had sound in both Linux and Windows VMs.
Just standard build/installed the main system, and the VMs, the builds saw what I had and just did the right thing(s).

Couple of years ago, replaced with better machine, loads of memory, good quality components etc., went with openSuSE LEAP 15.2

WkStation VM, also openSUSE 15.2, no audio in Firefox or social media, etc.

Messed with it some, no avail, finally just lived with it and sent things I wanted to see & hear to my iMac. Upgraded to 15.3 maybe two years ago, hoped it'd fix itself, it did not, I didn't mess with it.

Just upgraded to openSusE LEAP 15.4, saw some interesting things and thought I'd try it again. And again, nothing I'm finding in the web-searches and the forums is moving this along.

I'm listening to Internet radio at the top-level (Server: openSuse-LEAP 15.4), but no audio in VM (openSuse-LEAP 15.4) -- testing with uTube.

Long standing problem. Where do I begin?

Problem resolved.

I fixed the Codec problem, before which some video played without sound, some didn’t play: bad format.

Since I fixed Codec, all video played but still no sound, and I kept researching and trying things to no avail: everything was more-or-less as it should be.

During all this a couple of SuSE updates occur – they happen regularly, eh?

Today, I tried a video, and it worked. So I tried everything that didn’t work and it now works as well. I’ve spent the day getting all I wanted set up and tested.
And now I’ve got video with sound, and VLC’s now playing all my internet radio, etc.

I have to suspect the Codec had been the problem.
And when I fixed it, it was incomplete, but since, during the YaST onlineUpdates gaps were found and resolved.


Not sure how to mark this complete, I may have to come back.