Hi, I think you’re getting it wrong… You can use 6 devices and they can be with different DACs. Maybe you’re having another issue, which we can help you with. Just contact us at support at volumio.org
We are working hard to improve the app. As of now, the Android version is really slow (it has to do with the webview on React Native, it works great on iOS but really bad on Android).
Did you try writing the IP in the mobile browser? That works just fine.
This feature is 90% complete and we plan to release it within few months, together with the multiroom synced playback feature.