Page flip sound is a feature that enables the sound that enables flipping paper, very similar to a magazine. 

To use the flip sound effect, go to Design Template-->Features. 

Scroll down the list of features until you see Enable Flip Sound.

To turn it on, check the box and save before you exit.

To turn off, uncheck the box and save before you exit.

Once you click the checkbox to activate the page flip sound, you will see the volume control bar appear below:

Use your mouse to push or pull the white circle to the appropriate volume level of the scroll bar.  

Once you've made your desired adjustments, press Save before you exit.