Joins two similar sounds so the scene change connects through the ear and surprises the viewer.
Scream to train whistle, alarm to birdsong, bottle pop to fireworks.
Don't rely on generated sound; prepare the sound effects separately. Line up the ending peak of sound A and the starting peak of sound B at the cut point (atrim, adelay, amix).
Two-shot sequence: Shot 1, close-up of a kettle on a stove with a rising high-pitched whistle and steam filling the frame, 3 seconds; hard cut at the whistle's peak to Shot 2, a steam train pulling into a misty station, its horn blast at the same pitch and volume, 3 seconds. No music, so the matching sounds carry the transition.
The 39 Steps (1935) — the cut from a scream to a train whistle
Not verified