@clio09 - you wrote:
is Roon Core the only option to make this work?
Diretta protocol is agnostic regarding where the music comes from. The integration I've been using is via AudioLinux, which supports many popular protocols, including UPnP, AirPlay, Signalyst NAA (for HQPlayer), Slimproto (for Lyrion/LMS integration), Spotify Connect (not lossless yet), and several others. No TIDAL Connect or Qobuz Connect since that would require an open-source implementation, but perhaps someday.
Roon already has the most capable UI, but it has long been dogged by sound quality that's inferior to most other solutions. Diretta enables Roon subscribers to enjoy the best UI without having to give up sound quality.

