that works but the problem remains that it does not work with this command:
playSound("enhancedjavasound", "doorbell.mp3", new PercentType(100))
as playSound seems to address “Master” volume control only.
that problem is a known problem which has already been fixed
https://community.openhab.org/t/warning-audio-sink-warning-master-volume-level/44789/5
for any reason it reapeared in openhabian