Hifiberry Digi+Pro no hardware mixer

Hi everybody,

I have a fresh Volumio installation, lastest version, on Raspberry Pi 3 Model B+ and HifiBerry Digi+ Pro as transport.

The problem is that I can’t select “Hardware” mixer, I can only choose “None” or “Software” as you can see in the screenshot.

If I change the audio output to “Audio Jack” and save, Volumio refreshes the page, set the ouput again to Hifi Berry Digi+ Pro, the mixer becomes “Hardware” but I got no sound.

What can I do?

Thank you

Schermata 2019-01-26 alle 19.17.30.png

Does anyone can help me?