Can´t control volume

Volumio Information

Volumio Version: latest
Hardware: Raspberry PI with digi+ connected via coaxial to a Lyngdorf TDAI-2170
DAC: Lyngdorf TDAI-2170

I can not set volume it is at maximum level. Tried changes in volumio (mixer changed to none and software) but no luck and the Lyngdorf doesn´t respond at all. Had the same problem with Roon, I supose it´s the DAC in my amplifier that causes the problem. But what can I do?

In roon I set it to “dsp volume”.

Solved it. The Lyngdorf was set as HT.