learn the controls by providing hints, for example by
        // bouncing the down arrow when they first encounter a vertical slide
        controlsTutorial: false,

        // Determines where controls appear, "edges" or "bottom-right"
        controlsLayout: 'edges',

        // Visibility rule for backwards navigation arrows; "faded", "hidden"
        // or "visible"
        controlsBackArrows: 'faded',

        // Display a presentation progress bar
        progress: true,

        // Display the page n