Thanks @DIYprojectz for the instructions! Sound plays nicely 
I am still having a problem with setting volume - changing the volume in alsa-mixer has no affect.
All settings are on 0, yet sound still has volume when played!
$ uname -a
Linux rockpis 4.4.143-69-rockchip-g8ccef796d27d #1 SMP PREEMPT Tue Jun 14 12:32:20 UTC 2022 aarch64 GNU/Linux
Any help how to control the volume via the command-line/alsa is most appreciated!
(also posted here: Rock PI S audio volume settings)