Cambridge Audio CXA81 roon tested / usb volume

Hello,

As this post stated (https://blog.roonlabs.com/roon-partner-update-september-2019/) the Cambridge Audio CXA81 is Roon Tested. If I got this right, it means that if I use a USB streamer like Pro-Ject Stream Box S2 Ultra (roon ready) to feed the amp, I should “see” the pair in roon natively.

There is a question wich I cannot answer tho: the USB volume control is supported like the pro-ject maia DS2 (if I move the wheel the change of volume is displayed in roon) or are the 2 volume separates?

Thank you