Install for New Dolby Atmos Gaming Option
If you play a lot of games on your Galaxy Note 9 you might want to give Android Pie a try because it delivers an excellent upgrade for Dolby Atmos sound.
If your Galaxy Note 9 is running Android 9.0 you get a new dedicated listening mode for games. According to Samsung, the new game mode enhances “gaming immersiveness and sound effects".
Translation: It improves background sounds. This is useful when you're playing a shooter and you need to hear the sounds around you.
Instead of adding it to the existing options Samsung's included a separate toggle called Dolby Atmos for gaming in the Galaxy Note 9's sound options.
Head into Sounds and vibration > Advanced sound settings > Sound quality and effects in the Settings app to turn it on.