Last release of Volumio 3 issue on Rasp400

Volumio 3 Issues?

Please see: Volumio 3 issues: hints and solutions before posting a new issue.
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Just upgraded system to latest december file
The Raspi400 find the USB/SSD and all my music files
The external USB DAC M2Tech Young is detected and enabled
But when i hit play on a music track NOTHING comes out…?
It drives me mad since i tried many times to get it sorted.
Thanx in advance for an accurate help!

Please check the mixer controls.

OK thanx a lot, i’ll check: I’ve had it set to nothing: after setting software it works with the latest 4 december release…