Hi @PhillR ---- Thank you for touching base with me and providing the results of your testing with the tech support team at Innous. As always, the insight is very appreciated!
Moving forward, in regard to your question:
“Is there any way to keep both the Roon volume control & native DSD playback?”
We’ve chose to put volume control in the endpoint to minimize lag/latency when changing volume. Doing a DSD soft volume control would consume a lot of resources as many endpoints in our ecosystem are not powerful enough to perform the adjustment.
Our CTO Brian goes into further details on this design choice here and here.
-Eric