​@AlanX 

You can easily listen to all of your preferred music contend via bluetooth connection. Just connect Ace via bt to your smartphone and use an app (for music library any network audio player) that supports your music content. 
Swap mode is using much more battery capacity and there is no need to use it for playing stereo music. 
TV swap primarily is useful for multichannel audio from tv sources. 

Hi. Thanks for response

which iOS app would you recommend that would allow me to play the music stored on my Synology Nas 

which is where my sonos music library and play lists are stored and also where I stream from to my

various Sonos speakers all day.

thank you 

With TV Audio Swap you are going to be sitting down watching the TV. When listening to music, you are more likely to wander around your home. If you’ve ever tried wandering whilst in a TV Audio Swap session, you will know that you can’t actually venture that far from the soundbar before the audio drops. Bluetooth has a much greater distance in comparison, when the Bluetooth device is left in one spot and you wander with Ace.

Some good insight from Sonos into why the Ace integration with Sonos app is limited to TV audio is provided in following link:

https://www.reddit.com/r/sonos/comments/1d48zpa/comment/l6i34ts/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

When forced into this odd situation, any music app that runs on iOS should be able to see your music on the NAS, as long as your phone is connected to your WiFi and the NAS. I happen to use Apple Music (formerly known as iTunes), but it’s fairly rare that I have to use it inside my home….

Thank you all for the responses.

​@AlanX 

For iOS I can recommend the app „evermusic pro“. I use it myself and easily can add and access my nas. 

Just as an addition - your Sonos playlists are stored on the system itself, not on your NAS. So Sonos playlists will not work with the Ace.

Hi. Ever,music seems to work thanks

and my play lists are m3u files on the Nas and these  seem to work as well

thanks to all

Thank you for the feedback. I think I‘m going to add m3u playlists to my nas, too. Until now I just used the folder option to stream via evermusic app. 

The top voted comment in that thread is really what we’re asking for - understanding the limitations Keith mentioned.

Fascinating insight and appreciate the transparency. I think a lot of the complaints would go away if there were a way to beam other types of line-in audio into the headphones, not just TV audio, as well as products like the Victrola turntables. I don't need Sonos headphones to connect directly to Apple Music, but it would be nice if they were able to take advantage everything I already have hooked up to Sonos hardware!

re: distance, maybe let me decide that? My turntable isn’t that much farther from my Arc. I don’t only watch TV in my media room - there’s books, board games, lounging, etc. I often put music on to listen intentionally, not as background while I carry on with other tasks walking around the home.

​@aperture - Have you tried to walk around your home whilst in a TV Audio Swap session? I certainly could not cover my home without the sound dropping, whereas Bluetooth to Ace gives me full coverage of house and garden when Bluetooth device left in Living room.