Sound at a cut is the cheapest professional-sounding thing you can do to a video, and the easiest to ruin. The difference is almost entirely spacing.

Why a cut wants a sound at all

A hard cut is a discontinuity. Picture changes instantly, and if audio does not acknowledge it, the brain registers a small glitch. Adding a sound at the cut point gives the discontinuity a cause, and the edit stops reading as an edit.

This is the same reason a door closing in a film is louder than a door closing in life. The sound is not there for realism, it is there to tell you something happened.

An audio waveform shown before and after silences are closed up, the take shorter.

Three sounds, three jobs

Almost all cut sound design comes down to three families. Whoosh, impact and riser at cuts goes deeper; the short version:

Sound What it says Put it under
Whoosh Something moved A transition with motion: a slide, a whip, a zoom punch
Impact Something arrived A hard cut you want to land, a title appearing, a reveal
Riser Something is coming The seconds BEFORE a cut, building into it

The riser is the one people get wrong. It goes before the cut, not on it. A riser landing on the cut is just a strange whoosh.

The rule that matters more than the choice

Spacing. A sound every two seconds stops being sound design and becomes texture, and the viewer's ear tunes it out in about fifteen seconds, at which point you have added noise for nothing.

The working rule: no more than one cut sound every four to five seconds, and never two in a row on adjacent cuts. If you have a rapid-fire sequence of six cuts, put a sound on the first and the last, and let the middle four be silent. That gives the sequence a shape instead of a machine-gun.

Doing it automatically on a Mac

Zella has an Auto Sound button in the editor sidebar. It places a matching sound effect under each cut, choosing whoosh, impact or riser by the type of cut, and spaces them so a heavily cut timeline never machine-guns.

Two practical notes:

  • Apply transitions first. The choice of sound follows the cut type, and until a transition is placed a cut has no type beyond "a cut".
  • Tapping again removes every auto sound, and leaves yours alone. Sounds you placed yourself are not touched, which matters because a hundred placed sounds is not something you want to undo by hand.

Auto Sound is a Mac button. On iPhone, cut sounds arrive as part of Make it Viral, which is the bolder of the two one-tap bundles and includes the colour lift and the cut sounds that Auto-Polish deliberately leaves out.

The library they come from is the same one described in built-in music and sound effects, so nothing is fetched and nothing is licensed separately.

Levels

Cut sounds should be felt more than heard. If you can identify the sound as a distinct event while watching normally, it is too loud.

A useful test: play the video at half volume. The cut sounds should still be doing their job of smoothing the edits. If they disappear entirely, they were carrying nothing; if they are still obviously audible, come down.

They also need to sit under the voice, not next to it. Music ducking handles the bed, but cut sounds are short enough that ducking does not catch them, so set them by ear once and leave them.

When not to use them at all

Some material actively rejects cut sounds:

  • Anything with a serious subject. A whoosh under a cut in a video about a difficult topic reads as tone-deaf, immediately.
  • Long-form talking. A twenty minute explainer with a whoosh at every cut is exhausting. Save them for the openings and the section breaks.
  • Video already carrying strong music. If the bed has percussion, the cuts already have rhythm, and adding sounds fights it.

The honest summary is that cut sounds are a short-form technique. They make a sixty second video feel produced. They make a twenty minute one feel restless.

Apple's audio fundamentals guide is a good grounding in why level and timing do more work here than the choice of sample.

Common questions

Does a riser go before or on the cut? Before it. A riser builds into the cut, so it belongs in the seconds leading up to it. A riser landing on the cut just sounds like an odd whoosh.

Why do my cut sounds need transitions applied first? Because the choice of sound follows the type of cut, and until a transition is placed a cut has no type beyond being a cut.

How loud should a cut sound be? Quiet enough to be felt rather than identified. Play the video at half volume: the sounds should still be smoothing the edits without standing out as separate events.