I have DIY DAC
It’s installed with Combo384 DDC(www.amanero.com)
Many DIY people use Conbo384 USB DDC.
The combo384 support DSD256 at Window10 OS
But Roon is not support at RoPieee Linux RoonBridge system.
And Window10 Roon Core also not support DSD256 Native.
I hope Roon will soon becames support DSD256
Bellow is my test picture at Combo384, 2 type XMOS DDC