Indeed there are probably multiple paths to the full win. I like to use airsonic-advanced to feed music to my legacy sonos systems (can somebody please make an easy to use, pretty opensource alternative to the sonos multiroom software stack that can output to hifiberry's or ideally a cheaper alternative? even better would be an included best at each price level alternative speaker to double sided tape the hifiberry to). I also prefer to use beets and a cron job to convert my whole music collection into decent quality opus files and syncthing to get them onto my phone rather than using a frontend and mobile data to stream the flac files from my house.