May I suggest adding Google Cast for Audio in addition to Airplay? As I’m - and I think many others as well - using Android devices, it’d make it so much easier to use apps like Google Play Music to stream audio directly to volumio.
Yes, I also would very much like to see this feature implemented! I did however hear a rumour that google are very restrictive with the cast feature. I believe (if it is true) that the reason would be to further promote their own ‘castable’ speakers: google.com/cast/audio/
I do hope that this is incorrect and if anyone could shed any more light on the situation I would be grateful.