Short answer: attack decides how much of the transient gets through. Fast (0–3 ms) catches peaks and adds body, medium (3–8 ms) is the usual starting point, and slow (10–30 ms) lets the hit through for punch. Release decides how quickly the compressor lets go. On rhythmic parts, set it so the gain-reduction meter is back at zero just before the next beat: one beat lasts 60,000 ÷ BPM milliseconds, so 500 ms at 120 BPM. If you’re unsure, start at 100 ms.
| Source | Timing | Goal |
|---|---|---|
| Lead vocal | 3–8 ms attack 40–100 ms release | Even level without flattening consonants. Auto release works well here. |
| Rap vocal | 0–3 ms attack 40–100 ms release | Squashed and in your face. |
| Kick | 10–20 ms attack 80–150 ms release | Let the beater through, then control the body behind it. |
| Snare | 10–30 ms attack 100–200 ms release | Keep the crack, bring up the ring and the room. |
| Bass | 10–30 ms attack 100–200 ms release | Same level note to note, so the low end sits still. |
| Drum bus | 10–30 ms attack Timed to tempo release | Glue. The kit breathes with the song. |
| Other instruments | 3–8 ms attack ~100 ms release | Control without losing the pick or the bow. |
| Mix bus | ~30 ms attack 100–300 ms or auto release | 1–2 dB of gain reduction. Cohesion, not control. |
Starting points, not rules. Every one of these moves with tempo, arrangement and how the part was played, and the same number behaves differently on different compressors.
This guide covers what attack and release do, how to hear them, and where to set them on the instruments you’ll compress most.
What are compressor attack and release?
They are the two timing controls on a compressor. Threshold and ratio decide how much it compresses. Attack and release decide when, and that timing changes the sound more than most people expect.
Attack time is how long the compressor takes to apply most of its gain reduction once the signal crosses the threshold. Many designs define it as the time to reach about two-thirds (63%) of the full reduction. It decides how much of each peak or transient slips through before the compressor clamps down.
Release time is how long the compressor takes to recover once the signal falls back below the threshold.
Both are measured in milliseconds (ms). The lower the number, the faster the response.
How attack and release affect audio?
The right setting depends on the material, so start by knowing what each range does.
Attack time
Fast attack (0–3 ms)
Catches the transient. Use it to tame spiky peaks or to make a sound denser and fuller.
Medium attack (3–8 ms)
A good starting point in most cases. It controls dynamics without removing the transients completely.
Slow attack (10–30 ms)
Lets the front of the note through before compressing, which adds punch.
Release time
Fast release (50–100 ms)
Recovers quickly. Good for controlling spiky material and for an aggressive, squashed sound, but push it too far and the level starts to pump.
Medium release (100–200 ms)
Works on most material. It keeps some dynamic range while still holding things in place.
Slow release (300 ms and up)
Smooth and gentle. It brings up sustain and keeps the compression from being heard as movement.
How to set Compressor Attack and Release?
First decide what you want from the compressor, then look at the source. Each instrument is recorded differently, and songs differ in tempo and dynamics, so the same settings won’t fit everything.
How to set up an attack?
Start with drums, because you can clearly hear the attack on them. For a punchy drum, use a slow attack. For a bigger, longer, more sustained sound, use a short attack.
For most other instruments we use a medium attack. Sometimes a short attack is the right call to make a part sound squashed and jump out at you. It works well on bass guitar and rap vocals.
Slow attacks work best on drums and on the master bus. On other instruments we rarely use them, except bass, because most instruments don’t have that kind of punch at the front of the note.
How to set up a release?
For drums, use the tempo. Work out the length of one note in milliseconds and use that as the release.
| Tempo | 1/4 note | 1/8 note | 1/16 note |
|---|---|---|---|
| 70 BPM | 857 ms | 429 ms | 214 ms |
| 80 BPM | 750 ms | 375 ms | 188 ms |
| 90 BPM | 667 ms | 333 ms | 167 ms |
| 100 BPM | 600 ms | 300 ms | 150 ms |
| 120 BPM | 500 ms | 250 ms | 125 ms |
| 140 BPM | 429 ms | 214 ms | 107 ms |
| 160 BPM | 375 ms | 188 ms | 94 ms |
Quarter note in ms = 60,000 ÷ BPM. Halve it for an eighth, halve again for a sixteenth.
The full chart for every tempo:
Or watch the gain-reduction meter. Adjust the release until the needle returns to rest just before each beat, and you have it.
For other instruments, use your ears. For a squashed, limited sound, use a short release (10–50 ms). For a natural sound, use a long release (200 ms and up).
If you don’t have much experience yet, 100 ms is a good universal starting point.
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Attack and release FAQ
Does a fast attack make a sound punchier?
Usually the opposite. A fast attack clamps down on the transient, which is the part we hear as punch. To make a drum hit harder, slow the attack so the stick or beater passes through and the compressor works on the body behind it.
How do I know if my release is too fast?
You’ll hear the level surge between notes, a pumping or breathing effect where the background rises every time the signal drops. On bass or vocals it often sounds like distortion in the low mids. Slow the release until the movement settles.
What release time should I use at 120 BPM?
A quarter note at 120 BPM lasts 500 ms and an eighth note 250 ms. Start the release at one of those and adjust until the gain-reduction meter returns to zero just before the next hit.
Should I use auto release?
Often, yes. Auto release adapts to the material and is hard to beat on vocals and full mixes, where the signal changes constantly. Manual release is worth it on rhythmic sources, where timing it to the tempo is the point.
How much gain reduction should I aim for?
On individual tracks, 3–6 dB on the loudest moments is a normal working range. On the mix bus, 1–2 dB. If you need much more, the fix is usually volume automation or the arrangement, not the compressor.
Do attack and release times mean the same thing on every compressor?
No. Manufacturers measure them differently, and many classic designs are program-dependent, so the real timing shifts with the signal. The numbers on an 1176 and on a digital compressor aren’t directly comparable. Treat the dial as a starting point and trust the meter and your ears.
Should I compress before or after EQ?
Both work, and they do different jobs. EQ first when you’re removing something that triggers the compressor for no reason, like low-end rumble. Compression first when you want the EQ to shape a level that’s already stable.
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