QGC audio out problem, ubuntu 20.04

QGC doesn’t push audio out,
using QGC 4.2.3, and ubuntu 20.04
The audio from QGC doesn’t make it out when running spd-say “test” from the terminal all working fine, but QGC don’t make a sound, I check the bars in volume control and all are flat.

Do some have a hint what to check next?
thanks
David