In android operating system the notification volume is dependent upon incoming call volume by default. For example if you set high volume for incoming, the same is set for notifications. Here is a simple way to adjust the incoming call volume and notification volume separately.
– First of all open the Home Screen, go to MENU, and select settings. Then select Sound and Display as shown in the image above.
– Tap on Ringer Volume.
– Uncheck the box before Use Incoming call volume for notification.
– Now control/set the notification and incoming call volume separately and click OK.