What Is a Noise Gate (And How to Use It)?

A noise gate is a processor that automatically silences (or lowers) any audio that falls below a level you set, then lets the audio through again once it rises above that level. In plain terms, it shuts the door on quiet background noise — hiss, hum, amp buzz, room tone, headphone bleed — and opens it when the wanted sound arrives. It is one of the simplest tools in mixing, and one of the easiest to misuse.

Used well, a gate cleans up a track without you hearing it work. Used badly, it chops the start and end off words or notes. This guide explains what a noise gate does, the controls that matter, and how to dial one in.

How a noise gate works

A gate constantly watches the signal level and compares it to a threshold you choose. When the signal is louder than the threshold, the gate is open and audio passes at full volume. When the signal drops below the threshold, the gate closes and the audio is attenuated — fully muted, or reduced by a set amount.

This is the opposite of a compressor, which acts on the loud parts of a signal. A gate acts on the quiet parts. The two are often confused, so it helps to understand the difference before you reach for either — see our primer on EQ and compression fundamentals.

The controls you need to know

• Threshold: the level the signal must exceed for the gate to open. Set it just above the noise floor and just below the quietest part of the wanted sound.
• Attack: how fast the gate opens once the threshold is crossed. Fast attack catches sharp transients (drums); slower attack avoids clicks on soft sources.
• Hold: how long the gate stays open after the signal drops below the threshold. Useful for stopping the gate “chattering” on and off.
• Release: how quickly the gate closes once the signal falls below threshold. Too fast sounds abrupt; too slow lets noise back in.
• Range (or depth): how much the gate reduces the signal when closed. A partial reduction often sounds more natural than full silence.

How to set up a noise gate, step by step

1. Insert the gate first in the channel’s signal chain, before EQ and compression, so it acts on the raw recording.
2. Solo the track and listen to the quiet sections — the noise you want gone.
3. Raise the threshold slowly until the background noise disappears in the gaps.
4. Play the full performance. If the gate cuts the tails of words, notes or cymbals, lower the threshold or increase hold and release.
5. Set the range so the closed gate dips the noise rather than hard-muting it; -10 to -20 dB is a natural starting point.
6. Adjust attack: fast for percussive sources, slower for vocals and sustained instruments to avoid a clipped start.

When to use a gate — and when not to

Reach for a gate on noisy guitar amps, hissy DI signals, tom and kick mics picking up the rest of the kit, and dialogue or podcast tracks with steady room hum. It is a clean-up tool for clearly defined sounds with obvious gaps between them.

Be cautious on vocals and acoustic instruments with long, quiet tails. Aggressive gating makes breaths and reverb stutter. For background hiss on a vocal, gentle vocal processing and careful editing often beats a hard gate. And prevention beats correction: getting clean gain staging and a quiet recording environment means you need the gate far less. For more mixing context, browse the mixing and mastering hub.

Gate vs expander

An expander is a gentler relative of the gate. Instead of slamming shut, it gradually reduces level the further below the threshold the signal goes, which sounds smoother and more transparent. Many engineers prefer a downward expander for vocals and drums where a full gate would be too obvious. If your plugin offers an expander mode, try it before resorting to a hard gate.

Frequently asked questions

Does a noise gate remove noise during the actual performance?

No. A gate only acts in the gaps when the signal drops below the threshold. While the wanted sound is playing, the gate is open and the noise plays through with it. To reduce noise during a performance you need a dedicated noise-reduction tool or, better, a cleaner recording.

Where in the signal chain should the gate go?

Usually first, before EQ and compression, so it works on the raw level and is not confused by processing that changes the dynamics. The main exception is when you deliberately gate a compressed signal for a special effect.

Why does my gate sound choppy or stuttery?

This is “chatter” — the signal hovers around the threshold and the gate flicks on and off. Fix it by lowering the threshold slightly, adding hold time, lengthening the release, or using a softer range instead of full mute.