This is a simple app that allows you to adjust the Ringer and Notification volumes with one slider.
Samsung and Motorola (maybe others) decided to split the Ringtone and Notification volumes on their current OS versions (4.0.x - 5.0.x). This makes it difficult to easily adjust them both without diving into the settings app, getting into the volume section and sliding them both where you want. This app will display a dialog that will allow you to easily set both of those volumes at the same time.
Note: It will only use the physical volume buttons to set both volume levels when the app is being displayed. This is not meant to be a global volume replacement, only a quick way to set both volumes at once.