The DS Audio App for iOS by Synology Inc.

The DS audio app was developed with the goal to make it as easy as possible to play your music. It’s not only free but also has the best user interface around!

Play and edit all the music on your DiskStation directly from the app for convenience. Search all the music by album, artist, or genre, browse the playlists you have created, or listen to new music you have discovered on the Internet. Rate and save the songs you like so you’ll never forget about them.