No volume control / Allo USBridge - Sparky - Mytek Brooklyn DAC

Dear Volumio music lovers,

I have an Allo USBridge connected with USB to my Mytek Broolkyn DAC. The volume options are “Mixer type = Software” and “MPD client volume control = On”.
Still I have no volume control in the Volumio GUI when I play radio or any other source.

How can I solve this?

Best regards,
Olaf

Volumio Information

Volumio Version: 2.852
Hardware: Allo USBridge with Sparky SBC
DAC: Mytek Brooklyn (USB input)

An update and closure of this topic. This seems a hardware/driver issue with my DAC. See also my support question “No Spotify Connect / Allo USBridge - Sparky - Mytek Brooklyn DAC”. I simply accept that in the combination Allo USBridge with Mytek Brooklyn there is no volume control in the Volumio User Interface.