The clip runs just over nine seconds, giving the repeated knocks room to play without needing a loop. Download the MP3 if you want to keep it offline or place it directly into an editing timeline. For shorter scenes, trim after the knock pattern you need rather than speeding it up. It can also be assigned as a ringtone or notification tone where custom audio is supported. Lower the level when dialogue is present, since the sharp impacts can mask speech. Pair a doorway reveal with a Vine Boom for exaggerated comedy.