I'm using the Pro-Ject Streambox S2 Ultra, which runs a version of Volumio (which I'm familar with after previous using Volumio with an RPi). I prefer to run the streamer as a DLNA renderer, controlled with JRiver Media Center. I found initially that this was not working properly - any track I played would stop after 10 seconds. I then found that if I set JRiver to 'Disable SetNext Support' then it works okay, but without gapless playback. So I guess Volumio does not currently support SetNext?