I recently found a way to stream music from my Spotify and Google Play Music to my stereo systems.
I use a Nexus 7 Tablet with BubbleUPNP. I have Cyanogen Mod 11 and the Xposed Framework installed, which enables the “Audio Cast” function in BubbleUPNP. With Audio Cast on, Bubble sends all audio signals on the tablet to the selected renderer.
This works flawlessly with my living room setup (Denon AVR-X1000 set as renderer). Unfortunately on Volumio it does not work.
Sometimes I get silence, most of the times I get nasty distorted sounds when trying to play over Audio Cast. I tried both services, Spotify and Google, tried with DAC (Behringer UCA202) and without, did various reboots, reinstalls, all to no success.
Maybe someone can help me here, thanks in advance!
My specs: Raspberry Pi Model B, Volumio 1.4, WIFI, 2mA PSU
Edit: Maybe I should add: Normal Playback (MP3s over NAS) works like a charm.