After watching the latest John Darko video I’ve ended up here at rooextend where you’ll find the solution to your wants using a Microsoft Dial controlle, I’m trying to see if it will work my setup. Roon on iMac to CXNv2 streamer by USB, i can’t see why not so may give it a try as now the raspberry pi interface is an all in one unit that doesn’t need tinkering with makes it simple to setup.