I run Roon from my PC on a rack with keyboard and mouse. I can control it remotely with an iPad. OK.
What I need is a relatively large physical volume knob at the PC and what I have found is a USB volume control (https://www.droking.com/usb-controller-usb-volume-audio-adjuster-pc-speakers-switch-control-module-for-adjusting-volume-of-computer-laptop?search=Volume%20control&description=true). This works fine with JRiver set for internal (DSP) volume control. There is no setting where Roon will respond to it. Is this possible?
Also, have anyone tried the Microsoft Surface Dial for this?