Volume
Set the system volume level, and set default volume for call ringtones, notifications, and other media.
Note: You can also set System volume from the Home screen by pressing the Volume key.
1. From a Home screen, tap Apps
2. Tap Volume and then drag the sliders to set the default volume for:
Ringtone: Set volume for ringtones.
Media: Set volume for media (videos and music).
Notifications: Set volume for notifications.
System: Set volume for system sounds.
Settings
> Settings
> Sounds and notifications
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