Remove Background Noise in Logic Pro: Gate First, Then Cleanup

What Logic gives you

Logic Pro's stock answer to unwanted noise is the Noise Gate, and Apple's documentation describes it precisely: a dynamics processor that allows signals above a threshold to pass while reducing signals below it, used to suppress noise that is audible when the signal is low. The examples Apple gives include background noise, crosstalk between sources, and low-level hum, which is a fair summary of what a gate does well.

The processor lives with the dynamics family and offers more control than the one-knob gates in consumer tools: a reduction amount, hysteresis, attack, hold, release, and even sidechain filtering for difficult cases. That depth is why Logic users keep the gate on the track while tracking or mixing, and why the settings reward five minutes of understanding.

The boundary to internalize before touching anything: a gate works on level, not on frequency. It silences what falls below the threshold and leaves what rises above it untouched, which means the noise bed under a speaking voice walks straight through.

Setting the gate for voice

A practical starting routine for a vocal track, following Apple's parameter guide:

1. Insert Noise Gate from the channel strip's dynamics menu: Dynamics > Noise Gate.
2. Set the threshold just above the noise floor, so the pauses close but the quietest words still open the gate.
3. Choose the reduction amount: fully down for complete suppression of sub-threshold sound, or higher to let low-level detail pass.
4. Set hysteresis to about minus six decibels as Apple's guide suggests, which stops the gate from chattering around the threshold.
5. Fine-tune hold and release so word endings fade naturally instead of chopping.

Chattering and how to stop it

Chattering is the gate's signature failure: a rapid open-close flutter when the signal hovers around the threshold. Apple's documentation names it directly and offers two fixes: the hold parameter, which keeps the gate open a minimum time after the signal drops, and hysteresis, which sets separate open and close thresholds. Raising either smooths the behavior; the trick is to apply them until the flutter stops without making the gate feel sluggish on real words. If no combination feels right, the gate is likely on the wrong job; check the bed question above before fighting the settings further.

Gate versus the bed under speech

For a hissy take, the gate changes the pauses and leaves the sentences exactly as noisy as before. That is not a defect in the tool; it is the definition of a level-based processor, and it is the same lesson that runs through the GarageBand gate guide. Deciding which job a recording actually needs, gap cleanup or bed reduction, takes one listen to a single sentence with the noise audible underneath.

When the job is the bed, two options exist: spectral tools later in the mix chain, or a file-based cleanup pass on a copy. The hiss-reduction walkthrough covers the direct case.

Where the gate sits in the chain

A gate's position in the effects chain changes what it hears, and therefore what it can clean. Place it early, before compression and tone shaping, and it acts on the raw signal where the noise floor is lowest and most consistent. Place it late, after a compressor has raised the quiet parts, and the gate is now chasing noise the compressor amplified, with a threshold that has to be set higher and performs worse.

Apple's own framing of gates in its production tools notes the processor is often first in a series of effects, and that guidance applies doubly to noisy sources: the earlier the gate closes on the noise, the less of the chain has to cope with it. For a vocal recorded in a home room, the practical order is gate, then tone, then dynamics, with a final listen through the whole chain before committing.

A worked session: the noisy vocal take

A concrete walkthrough makes the parameters less abstract. The take: a sung verse recorded at home with a computer fan audible between phrases. The plan runs in four short stages.

First, listen and locate the floor: solo the track, find a gap where only the fan plays, and note how far the meters move. Second, insert the gate and set the threshold just above that floor, checking that the quietest sung word still opens it. Third, tame the flutter: raise hold until the openings feel natural, and set hysteresis around minus six decibels so the gate stops chattering near the threshold. Fourth, bypass-compare the verse against the gate, fix any chopped word endings with a nudge of release, and move on.

What the session does not do is fix the fan under the singing. That bed remains in every sustained note, and it is the case the hiss-reduction walkthrough and a file-based pass exist for. The gate handles the geography of the take; the reduction handles the layer. Two tools, two jobs, one take: that division is the whole philosophy of this guide.

Sidechain filtering for stubborn cases

Logic's gate includes sidechain high and low cutoff filters, and Apple's documentation describes their purpose with a drum-kit example: isolating the snare from the hi-hat by filtering which frequencies can trigger the gate. The same technique transfers to a voice over a narrow-band noise: filter the trigger side so only the voice's range opens the gate, and a hiss or hum outside that range stops influencing it. It is an advanced move, and it earns its place when ordinary threshold tuning keeps failing on one specific source.

The export-and-clean path

When the bed needs a dedicated pass, the round trip is short:

1. Bounce or export the track as a WAV, keeping the project untouched.
2. Upload one file to SimpleClean. Up to 500 MB and 15 minutes; audio in WAV, MP3, M4A, AAC, FLAC, OGG, or OPUS.
3. Compare Original with Cleaned across a pause, a sentence, and the loudest passage.
4. Import the cleaned file back into Logic, mute the original track, and keep both versions until the mix is approved.
5. Archive both versions after delivery, so any later remix starts from evidence rather than memory.

When editing beats processing

Apple also ships Remove Silence, whose documentation frames it as a classic noise-gate effect for long recordings with numerous gaps. For audio books, voiceover runs, and interview sessions, cutting silence at the edit level often sounds cleaner than gating it in the mix, because the edit removes the noise entirely rather than hiding it below a threshold.

The order that serves most sessions: edit first to remove what should not be there, gate second for the gaps that remain, and clean the bed last, on the fader where it belongs. One last discipline: after any of these steps, take the mix to a phone speaker once. Gates and reductions behave differently on small drivers, and the phone is where more listeners meet the track than any studio monitor.

Related guides

The publishing workflow after cleanup is covered in how to clean podcast audio online, and the counterpart free-DAW walkthrough lives in GarageBand's gate setup.