Smart Volume Control
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Help Center » Why notification, ringtone and system cannot be seperated?

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Because newer version of Android 4.0< do not allow this anymore and volumes are linked together even though you chose only one of them.

Please see this page: https://code.google.com/p/android/issues/detail?id=23117 .

It is possible to root your device. You will then be able to control ringer, notification and system volumes separately.