Fixing Audio in the Edit: What Can Be Saved and What Can't

The rule above all others

A poor picture can be improved a great deal in the edit. Poor audio has narrow limits.

That's why the best investment in your sound isn't software or a plugin — it's two minutes before filming: close the window, switch off the fan, get close to the mic, and record ten seconds and listen back on headphones before you start.

What editing can fix

Levels. Raising quiet audio or lowering loud audio, and matching levels across clips filmed at different times.

Steady noise. A continuous hum from an air conditioner or appliance, because its tone is constant and can be identified and reduced.

Isolated sounds. A click, a knock, or a cough at a specific moment — removed or lowered.

Very low or very high frequencies. Ranges far from human speech can be cut with no effect on the voice.

What it cannot fix

Echo. When your voice bounces off the walls of an empty room, the reflection becomes part of the recording itself. No tool sends it back to the wall.

Wind. Air striking the microphone directly produces a sound that swamps speech entirely. Prevention is a foam cover; there is no cure.

Distortion from recording too loud. When audio is recorded beyond what the device can handle, the detail is permanently lost. What's gone doesn't come back.

Speech that wasn't intelligible to begin with. If you couldn't understand it by ear in the raw recording, nobody will after any processing.

The general rule: editing adjusts what exists. It doesn't create what wasn't recorded.

The order of audio work

Follow this order — changing a step undoes the ones before it:

1. Delete what you don't want. Failed sections and isolated noises.

2. Reduce steady noise if present, and as lightly as possible. Overdoing it makes the voice metallic, as if underwater.

3. Match levels across clips, so the viewer never has to adjust their device volume mid-video.

4. Set the music below the speech.

5. Listen to the whole video on headphones before publishing.

Levels in practice

Without complicated technical numbers, these rules are enough for a beginner:

Speech is always loudest, and it's the reference for everything else.

Music clearly below speech. If you notice it while someone is talking, it's too loud.

Ambient sound below both — and its presence matters. Total silence behind speech sounds dead and unnatural.

Never let the meter touch the far right. Approaching the ceiling means distortion; always leave headroom.

Common mistakes

Raising the volume too far. It raises the noise with it, so you get loud speech and a loud hiss.

Overdoing noise reduction. The most common error. The voice ends up sounding like an old telephone. The rule: reduce until the noise recedes, not until it disappears.

Reviewing on laptop speakers. Computer speakers hide many faults. Use headphones.

Forgetting ambient sound. If you delete every gap and butt the speech together, the video sounds artificial. Leave room tone underneath to bind the clips.

What to do on location to save yourself later

These make the audio stage of editing almost empty:

• Record a minute of room tone with no speech, to fill gaps
• Get close to the mic — distance matters more than price
• Film in a room with furniture and carpet, not an empty one
• Watch your recording level during filming, not after
• Listen to a ten-second test on headphones before starting

Choosing the right microphone is covered in The Best Microphones for Filming on a Phone: How to Choose and Why.

In short

Fix what can be fixed in the edit, and accept that what was ruined in the recording is ruined.

The time you spend trying to rescue bad audio would have covered refilming the section with clean audio — and that's usually the right call. The full order of editing stages is in Editing Basics: Start by Deleting, Not Adding.