Samsung J320 - Volume

Settings 264
Tap Sound mode, and then choose a mode: 2.
 Sound: Your phone uses the sounds, vibrations, and volume levels you have chosen in
Sound settings for notifications and alerts.
 Vibrate: Your phone vibrates for notifications and alerts.
 Mute: Your phone plays no sounds or vibrations. Reminders will still occur.
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.
From home, tap Apps > Settings > Sounds and notifications . 1.