Everything You Need to Know About Noise Gate Pedal

A noise gate pedal does one job: it silences your signal when it drops below a set level. That simple function is remarkably useful for electric guitarists and bassists who deal with hum, hiss and interference in their signal chain — especially in high-gain and live performance contexts.

How a Noise Gate Works

The pedal monitors the level of your input signal continuously. When the signal drops below a threshold you set, the gate closes and the audio output is muted. When you play above the threshold, the gate opens and the signal passes through normally. The threshold control is typically the primary adjustment: set too high, and the gate clips the beginning of quieter notes; set too low, and background noise bleeds through during pauses.

Most units also include attack and release controls. Attack governs how quickly the gate opens when the signal exceeds the threshold. Release (sometimes called Decay or Hold) governs how quickly it closes when the signal drops. Faster release settings cut noise more aggressively; slower settings create a more natural fade.

What It Removes

The noise a gate deals with falls into three broad categories: mains hum (50Hz or 60Hz depending on territory), high-frequency hiss from overdrive and fuzz pedals, and general radio frequency interference picked up by single-coil pickups or long cable runs. In all cases, the gate works by silencing the signal during pauses in your playing, which is when noise is most audible. It does not remove noise while you are actively playing — for that, shielding, shorter cable runs and quality power supplies are the actual solutions.

Types Available

The most straightforward type is a simple inline gate: signal in, gate applied, signal out. These are compact, easy to use and effective for moderate noise situations. More sophisticated designs include a send/return loop, which allows you to route specific pedals — typically your gain stages — inside the gate’s detection circuit. This means the gate tracks the signal going into your dirt pedals while the gate itself processes the output, resulting in tighter, more accurate gating than an inline-only approach. The Boss NS-2 popularised this approach and remains a standard reference point for the format.

Dual-channel or stereo units serve players with two-amp rigs or stereo effects chains. Rack-mounted expanders serve those with more complex professional setups.

Noise Gate Versus Noise Suppressor

These terms are often used interchangeably in marketing, but there is a meaningful distinction. A noise gate cuts the signal hard at the threshold — a binary open/close action. A noise suppressor applies variable attenuation: as the signal gets quieter, the suppression increases gradually rather than in an abrupt step. In practice, many modern units do both, and the distinction matters less than the quality of the implementation. The ISP Decimator line, for instance, markets itself as a noise suppressor while functioning as a highly effective tracking gate.

Common Use Cases

High-gain guitar with single-coil pickups is the classic use case: even a moderate overdrive becomes noticeably hissy, and a noise gate pedal makes that hiss disappear between notes. Heavy rhythm guitar benefits similarly — tight, muted riff work becomes cleaner and more defined. The pedal is also useful for managing noise during silent passages in live settings, where amp hum or stage interference might otherwise be audible through the PA.

For buying guidance and model comparisons, see our noise gate pedal buyer’s guide. For setting one up from scratch, read our beginner’s guide.

Frequently Asked Questions