I would love to see Roon Speakers support in Raspberry Pi. There are a number of popular OS’s specifically designed for audio playback, with perhaps Volumio (see https://volumio.org) being the most popular (formerly known as RaspyFi). A number of these including Volumio use MPD (see http://www.musicpd.org/) for playback. I would love to see Roon support MPD endpoints natively in the same way it recognizes AirPlay, or short of that writing a little middleware daemon to bridge the “Roon Speakers” protocol to MPD similar to what upmpd did for UPnP (love it or hate it there are lots of these devices out there). If you were to publish it as open source, I’m sure the Volumio folks would be happy to bundle it in.