Input Output (compressed) Threshold zone
Gain reduction -0.0 dB
-18 dB
4 : 1
10 ms
120 ms
About Dynamic Range Compression
Dynamic range compression reduces the difference between the loudest and quietest parts of an audio signal. It is one of the most fundamental tools in mixing and mastering.
Parameters
- Threshold — the level (in dB) above which compression begins. Signal below the threshold passes through unchanged.
- Ratio — how much the signal is reduced once it crosses the threshold. A ratio of 4:1 means that for every 4 dB above the threshold, only 1 dB comes through.
- Attack — how quickly (in ms) the compressor responds when the signal rises above the threshold.
- Release — how quickly (in ms) the compressor stops reducing gain after the signal falls below the threshold.
Reading the Display
- Gray line — the original (input) waveform.
- Blue line — the compressed (output) waveform.
- Red zone — the region above and below the threshold; audio in this zone is subject to gain reduction.
- Gain reduction meter — shows the average amount of level reduction being applied.