OK, the documented procedure to mute audio on iPad / iPad 2 / iPad 3 and new iPad mini / iPad 4 is to use the lowest part of Volum Up/Down button by pressing and keeping it until the sound is completely off. But what if you need a really quick way to mute volume on Apple tablet? You are aware that Apple has assigned the ‘Screen rotation lock’ function to the button which was originally designed to mute the gadget. This button is there just above Volume Up/Down one, but it is used to lock and prevent screen rotation while physically rotating iPad. Nevertheless you still need such functionality as to mute your iconic tablet instantly. Don't panic, change can come quickly and easily, just follow this sequence:
Make sure that Lock Sounds switch is ON. To check it go to Settings > General > Sounds
For now on you can mute your tablet instantly:
Just press the Volume UP/Down button in its middle part The iPad's volume will jump to zero.
To enable sound back press and hold Volume UP.