Fiio K11 R2R native DSD an hardware volume

Help and Support
1

Hi everybody,
I am using a Rpi4 with latest volumio. Music is stored on SSD as Flac and DSD files. I bought an USB Dac from Fiio. K11 R2R.
Can somebody tell me the correct settings for playing native DSD?
Is it possible to set hardware volume control with this DAC?

Regards Daniel

2

Nobody there who can help me?
Is there a way to test if the DAC supports hardware volume control?