Anatomy of a Compressor
Every compressor exposes the same controls — once you read one, you can read them all.
In Ableton Live: Compressor. Set "Knee" to 6 dB for a soft knee, 0 dB for a hard knee. Use the "Activity" panel (top-left dropdown) to see input/output curves while dialing in the ratio.
| Control | What it actually does |
|---|---|
| Threshold | The level at which the compressor switches on. Lower it and more of the signal gets compressed. |
| Ratio | How aggressively the signal is held down once it crosses the threshold. 4:1 means for every 4 dB over, only 1 dB makes it through. |
| Attack | How quickly the compressor clamps down after the signal exceeds the threshold. Slow attacks let transients through; fast attacks catch them. |
| Release | How quickly the compressor lets go once the signal drops back below the threshold. Sets the rhythmic feel of the compression. |
| Knee | How abrupt the transition into compression is. Soft knees ease in around the threshold (more transparent), hard knees switch on instantly (more obvious). |
| Makeup Gain | A volume knob at the output to replace the level you just lost. Match it carefully if you're A/B-ing the bypass. |
| Gain Reduction Meter | The truth-teller. Shows how many dB the compressor is currently pulling down. If it's slammed, you're working it too hard. |