Briefly tried to see what Volumio is. I have tried with free membership, and was very glad with the product. Spotify works fine, both connect and browing app. I was happy with the gapless playback which works pretty well RPi 2, whose hardware is pretty weak. The only shortcoming is that Volunio does not read and sort songs as per tracks number. I noticed that playing music from Windows music library. I know that the issue is with Volumio, since all other platforms such as Kodi or BubbleUPnP read and sort songs properly. I believe this is something that developers can resolve easily. Otherwise highly recommended.