How to use compression in your mix
Compression controls dynamic range. This guide explains the key parameters and how to apply them without flattening your mix.
A compressor reduces the volume of signals that exceed a threshold you set. This controls the dynamic range of a sound, making quieter moments louder and loud peaks more controlled.
Compression is one of the most misused tools in music production. Used well it adds punch, glue, and consistency. Used poorly it kills dynamics and makes a mix feel lifeless.
The five key parameters
- Threshold: the level at which compression begins. Lower threshold = more compression.
- Ratio: how much gain reduction is applied above the threshold. 4:1 means for every 4 dB over threshold, only 1 dB gets through.
- Attack: how fast the compressor responds to a signal exceeding the threshold. Fast attack catches transients; slow attack lets them through.
- Release: how fast the compressor stops reducing gain after the signal drops below threshold.
- Makeup gain: adds volume back after compression reduces the overall level.
Common compression tasks
Different elements call for different compressor settings.
- Drums: fast attack and release for punch, 4:1 to 8:1 ratio
- Bass: medium attack, slow release, 3:1 to 4:1 to even out notes
- Vocals: auto attack and release, 3:1 to 4:1 for natural-sounding control
- Bus/glue compression: slow attack (30-50ms), low ratio (1.5:1 to 2:1) for subtle cohesion
The bypass test
Always compare the compressed signal to the uncompressed original at the same perceived volume. This is the bypass test.
If you cannot hear a clear improvement when bypassing, use less compression or try different settings. Compression should serve the sound, not just be applied out of habit.
Frequently asked questions
What is gain reduction and how do I read it?
Gain reduction is the amount of volume reduction the compressor applies. It is displayed as a meter moving downward on most compressor plugins. A gain reduction of -3 dB means the compressor is pulling the signal down by 3 dB.
What ratio should I use for vocals?
3:1 to 4:1 is the standard starting point for lead vocals. This controls dynamic peaks without flattening the natural expression. Use a slower attack to preserve consonants and breath sounds.
Is it better to use multiple light compressions or one heavy compression?
Multiple lighter compressions at different stages is generally better. Serial compression produces a more transparent and musical result than one compressor doing all the work at a high ratio.
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