On advice of my local hardware dealer I installed JRiver.
Why is there no clear distinction between audio data (input) sources and audio output devices ("renderers" in your terms)?
I acknowledge that media devices can be data (input) device "Media server", output device (player, renderer, dac), or both. And adding network players can only be achieved by setting up "media centers". If my player was a media center it would certainly have its own web-interface nowadays. No reason to install JRiver. [Only because of limitations to that web-interface I want JRiver to find it as output device.]
There seems to be no clear way to configure, order and my physical output devices. My hifi DAC, nicknamed "Marvin" of brand Moon appeared for whatever reason after almost ten minutes in the list "Playing Now" alongside a "Player" and a "Playing from Main library" while Marvin or any other device was playing anything from a (not selected) source.
Adding a network streaming (radio) channel can only be done by right-clicking an existing item in the list, while default items cannot be deleted.
I will try it some days but probably will not buy a license.
My output devices are not visible in "Audio", which seems to be an data input/source/link to library and in "Drives & Devices" which is just another access to data.