If you drop a SECTION onto the form...
add a FIXED IMAGE to the background
then add a transition to the SECTION
INIT: opacity 50%
SCROLL-IN: opacity 100% - 750 ms Ease In Out
SCROLL-OUT: opacity 50% - 750 ms Ease In Out
SECTION will fade-in as expected.
Shortly before the SECTION goes off the page... the SECTION starts to scroll off the screen.