You could use the one built into Jellybean. Long Press on a blank space on your home screen, tap on Apps and Widgets then Widgets, tap and hold Settings Shortcut Widget, Scroll down to sound, tap on sound and a sound icon is created on your home screen. Tap on the sound icon then volume and you have access to the volume controls for Music, video, games and other media, Ringtone, Notifications and System on 4 different sliders.