SimAudio Moon 230HAD

Hi to all!
At first, the 230 only play .DFF as PCM. By adding
dsd_usb “yes”
in the audio_output section of mpd.conf, it fixed the problem.
I have a few others issues with Volumio that i want to try to solve by myself before asking.

I have to add that if i disable the volume control in the gear menu, my DAC consider .DFF as 352.8Khz PCM and it’s not reversible: If i go back to hardware volume control, it stay at 352.8. Go figure out…