in5 flipbooks do not automatically include a page flip sound effect. However, in5 is so flexible that it's easy to add this.

The steps are described in the video below.

Custom Code to Trigger the Sound on Page Turns

An explanation for this code can be found in the video above.

  var pageFlipDataID;
    pageFlipDataID = pageFlipDataID || $('[alt="page-flip-sound"] audio').attr('data-id');

Or if you prefer, you can download this code as a .js file.