Compressor attack and release explained: set them by ear

By Tongkit Leong · October 31, 2026 · 7 min read

Attack is how quickly a compressor starts turning a sound down after it crosses the threshold, and release is how quickly it lets go afterward. A slower attack keeps punch, a faster release keeps the compressor from dragging into the next note, and in the Tracks browser studio both are dials on every channel strip, free, with nothing to install.

What attack and release actually do

A compressor watches the level of a track. When the level crosses the threshold, it starts reducing the volume. Attack sets how long that takes to kick in. Release sets how long it takes to stop once the signal drops back below the threshold.

Those two times decide the character of the compression. Threshold and ratio decide how much a sound is turned down. Attack and release decide when, and that is where punch, groove and pumping come from.

Attack: how much punch you keep

The loudest part of a drum hit or a plucked note is the first few milliseconds, the transient. With a slow attack, the compressor is late, so the transient passes through at full volume and only the body of the sound is turned down. The result is a sound that feels punchy and open.

With a fast attack, the compressor clamps down on the transient too. The sound gets smoother and more controlled, but also softer at the front. That is useful for taming a harsh vocal or an uneven bass, and unhelpful on a snare you want to snap.

Release: how much groove you keep

Release is about timing against the music. If it is too slow, the compressor is still holding the level down when the next note arrives, so the part sounds dull and squashed. If it is too fast, the level snaps back up between notes and you hear the volume swell and drop, called pumping.

The best release usually lets the compressor recover just before the next hit. For a steady beat, that means tying it loosely to the tempo: faster at 150 BPM than at 80.

The compressor in Tracks

Every track's mixer strip has a compressor with five dials:

• Thr (threshold), from -60 dB to 0 dB.
• Rat (ratio), from 1:1 to 20:1.
• Atk (attack), from 1 ms to 300 ms.
• Rel (release), from 20 ms to 1000 ms.
• Mk (makeup), which turns the signal back up after compression.

For a refresher on the other controls and how a compressor differs from a limiter, read compressor vs limiter explained.

How to set attack and release in Tracks

Step 1: Set threshold and ratio first

Open the studio, select the track and find the compressor on its strip. Lower Thr until the loudest moments are being reduced, with Rat around 3:1 to start.

Step 2: Set attack by listening to the transient

Start Atk around 10 to 30 ms. Loop a few bars and listen to the front of each note. If the punch is intact, try a shorter attack; stop when the hit starts to feel softer.

Step 3: Set release to the groove

Start Rel around 150 to 250 ms. Shorten it until the part sounds lively, then back off slightly if you can hear the level swell between notes.

Step 4: Match the level with makeup gain

Raise Mk until the compressed track is as loud as the bypassed one. Louder always sounds better at first, so match levels before you judge.

Step 5: Check it in the full mix

Toggle the compressor off and on with everything playing. Keep it if the part sits better in the mix, not just if it sounds bigger on its own.

Starting points by instrument

• Snare and kick: slower attack (20 to 30 ms or more) to keep the snap, release around 100 to 200 ms.
• Bass: medium attack (around 10 to 20 ms), release around 150 to 250 ms for an even low end. Pair it with a bassline that locks with the kick.
• Vocals: medium attack (around 10 ms), release around 150 to 250 ms, 3 to 6 dB of reduction on the loudest phrases. See the vocal chain order.
• Drum bus: slow attack, fairly quick release, low ratio, to glue the kit without losing the hits.

These are starting points, not rules. Always adjust by ear.

Common mistakes

• Fast attack on everything. It makes drums and plucks dull. Slow it down.
• Release that fights the tempo. If the level never recovers before the next hit, shorten the release.
• Judging while louder. Use makeup gain to match levels before comparing.
• Heavy compression everywhere. Back off any track showing more than about 6 dB of reduction and see whether the mix opens up.

Frequently asked questions

Should I use a fast or slow attack?

Use a slower attack to keep punch on drums and plucked sounds, and a faster one to even out sounds you want smooth, like a sustained vocal or bass line.

What causes compressor pumping?

A short release combined with heavy gain reduction. The level drops on loud notes and snaps back in the gaps. Lengthen the release or lower the ratio. If you want the effect on purpose, see sidechain compression explained.

What is a good release time?

Around 150 to 250 ms is a safe place to start, then adjust so the compressor recovers before the next note.

Is the compressor free in Tracks?

Yes. Tracks is free and runs in your browser, with a compressor on every track.

Does my music get uploaded?

No. Your projects stay on your device.