🎵 Audio Playlist
The Audio Playlist layer plays a rotation of audio files on top of whatever else the project is showing.
Media chosen from your media library is published to the device together with the project, so it plays with no network connection. Items added by external URL are fetched while the layer plays and do need one.
It is the same layer as the Playlist one, offered a second time in the Add Layer panel with an audio slant. The fields are identical, you just fill it with audio files, typically mp3, instead of videos and images.
Only two of those fields change anything for a track: Playlist Audio Level sets the volume, and Enable shuffle randomizes the order. Every track plays for its own length, so Def. Media Duration has no effect, and neither do Def. Media Fit and the transition fields, since there is nothing to see on screen.
Use it to add a soundtrack to your project.