From Aeria Browser Wiki
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Background Music: Move this bar to adjust the volume of the music that plays in different parts of the game. If you uncheck the box above the bar, you can mute the music without adjusting the bar.
Audio Effect: Move this bar to adjust the volume of the various effect sounds that play for various actions in the game. If you uncheck the box above the bar, you can mute the music without adjusting the bar.
Special Effect: Turn this off to remove the special effects that weapons sometimes have especially during POW attacks. This can improve game performance on slower machines.
Trumpet/Horn: Turn this off to stop Trumpets and Horns from being displayed across the top of the game window. Horns appear in blue while Trumpets appear in orange.
Accept Invite: Turn this off to stop players from being able to invite you to chambers and fights. Their notifications will no longer appear in your game window.
Trumpet/Horn: Turn this off to stop notifications from appearing in your chat box when players from your buddy list log on to the game.