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"If you have an iOS device, you're probably familiar with the volume buttons located on its side. These buttons are usually set up to control the device's ringer and alert volume, but they can actually be reassigned to serve a different purpose. The volume buttons on your device can also be used to control the overall audio level within iOS.To change your volume buttons' functionality, watch the video or follow the steps below:\n\nStep 1: Go into the Settings app on your device and tap on Sounds. On the iPad, this section is located within General settings.\nStep 2: Under the Ringer and Alerts section, turn off Change with Buttons.\nStep 3: Exit out of the Settings app and go back to the home screen.\n\nNext time you use the volume buttons on your device, they will control the audio level of iOS instead of your ringer and alerts. With this option set, you'll have to go back into your device's sound settings when you want to change the ringer volume."^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2012/09/04/volume-buttons-functionality/>