Media Sync API

Whether only one is player should be playing at a time.

Whether media volume should be in-sync across all media players.

If a value is provided, volume will be saved to local storage to the given key as it's updated. In addition, when a media provider connects to the manager, it's volume will be set to the saved volume level. If no value is provided, nothing is saved or retrieved. Note that this includes both the volume and muted state.

Fired when media volume has been synchronized.