Are the volume buttons on your device broken? Are you always hitting the wrong one? Try VolumeSlider, the volume button replacer. Control up to four different volume streams* on the same screen by simply sliding your finger up or down the edges of the screen. It's that easy.
*Controlling 2 or 4 streams simultaneously requires the ad-free, paid version (just a buck!). Free version allows controlling one stream on the left or right side. Free version contains banner and interstitial ads and will indicate when an interstitial ad is about to be shown.