finally integrated into home automation

[streamy]

as is see, the web controller uses nodejs. it should be no problem to add it there.
you can change the code from that script by yourself, but it will be lost on every update.
so better to do this by the developer of the roon web controller.

streamy, its untested, but it should look like this: (volume slider not included)

You‘re amazing! I‘ll try if I manage to add the code in node.js of Mike‘s extension. Then, with your permission I will contact Mike on the Roon forum to ask him to integrate your code in his extension to add Phantom volume control as a feature. I think this could also interest some other Phantom/Roon users.