A sound on a cut
A whoosh plays over a push from one clip to the next.
The push runs over the 0.6 s the second clip overlaps intro, and the whoosh starts at the same moment, intro - 0.6, for the same 0.6 s.
<div id="intro" class="layer" data-start="0" data-duration="3">…</div>
<div class="layer" data-start="intro - 0.6" data-duration="3.6" data-clip-transition="push from-right power3.inOut">…</div>
<audio src="whoosh.wav" data-start="intro - 0.6" data-duration="0.6" data-volume="0.7"></audio>
Both are timed from intro, so changing its length moves the cut and its sound together.
An audio clip never counts as the clip a transition replaces, so the whoosh beside the two clips leaves the push as it is.