Recently acquired Ryzen 5 computer lacks sound with OpenBSD 7.1.

The computer has a Ryzen 5 4600G processor, as well as AMD High Def and
Realtek audio. I have tried unsuccessfully to get audio through the HDMI
connection as well as a Behringer UMC20HD USB sound card. I have looked
at the relevant man pages and tried to solve this on Reddit. It has been
suggested that I try the fount of all OpenBSD wisdom, so I am posting
here. The relevant outputs (thanks to Reddit feedback) can be found here:

https://pastebin.com/2rvjWuD7

https://pastebin.com/W26cMyMZ

My Reddit post can be found here:

https://www.reddit.com/r/openbsd/comments/ydsgo2/recently_acquired_ryzen_5_computer_lacks_sound/

I really like this computer, as OpenBSD appears to run well from it so
far, so I am hoping the audio issue can be solved...