Volume Mate

There are main 4 features.
-Normal Mode
-Vibrate Mode
-Silent Mode
-User Custom Mode

If you are dissatisfied with the android volume managing system,
this is the best solution!!!
Your mate of Android, VolumeMate!!!

-If unwelcome call is comming, just flip the phone!!
-You can lock your media volume at Vibrate/Silent Mode
-You can lock the Mode, so it won`t be changed by your mistake.
-If the headset/bluetooth is connected, It will automatically enter to vibrate mode.
(if you turn off the 'Headset Pref' option, it won`t be changed)
-If the headset/bluetooth is connected/disconnected, play/stop music(you can choose whatever you want to)
-There is the night mode. no more spam massage will wake you up at night.
-When the device is connected some wifi(you selected), it will automatically enter the normal/vib/silent/user mode.
-There is the Pin code system, so you can protect your settings of this app!!

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-Long touching the switch in Profile settings!! there are hidden menu!!

-settings -> Accessibility -> turn on the [Volume Mate]

-Only supported Korean Language now.... Sorry.
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http://blog.naver.com/chonjay/20164034205
There is the Manual of the Volume Mate
(only Korean language now, Sorry)