Hi!
Just wanted to share an Airplay problem and solution.
I am using RP3 and RuneAudio 0.4-beta.
Initially, I could not direct sound from my MacPro (Sierra 10.12.6) via Airplay to my RuneAudio.
The Airplay name RuneAudio(AirPlay) appeared correctly in may MacOSX System Preferences, but it was immediately kicked out after selection, and no sound on the RP3.
The solution simply was to change the Airplay name on the RuneAudio RP3 from RuneAudio(AirPlay) to RuneAudioAP, apply and save.
Apparently, the default name with the parenthesis was not acceptable for my Mac.
After the change, it worked perfectly.
BN