Burson Playmate on Rpi 4b Volumio

Hi everyone,
just finished install of volumio on Rpi4b and connected to Burson Playmate via USB.
Burson works, but I noticed that it gets max 48K when playinh a high res file.
I know that Burson is not MQA renderer but when I connect my iphone to it and play the same file I can see 88K on the burson screen.
Are there some additional settings for DAC hidden somewhere?
Thanks in advance fo help.