Join Brian Lee White for an in-depth discussion in this video Introducing compressors, part of Foundations of Audio: Compression and Dynamic Processing.
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Many instruments tend to be very dynamic and when recorded, can result in a wide range of note amplitudes, with some very loud and some very soft. It could be difficult to balance these very dynamic tracks in a mix and still hear every nuance of the performance. Compressors can be used to restrict the dynamic range of an audio signal, making it easier to find a more steady level that works in your mix. Let's listen to a simple example. (music playing) The vocal track is very dynamic and parts of it are getting lost behind the music, while others stick out too much.
Now I will apply compression. (music playing) As you can see, and hopefully hear, by applying compression, I was able to reduce the dynamic range of the vocal phrase to help it sit better in the mix and be lyrically intelligible at all times. In the original uncompressed vocal line, the difference between the softest and loudest word was about 15 dB on average.
After applying compression, the dynamic range is only 5 dB on average. What's happening here is the compressor detects and grabs hold of the louder words in the phrase and turns them down, or compresses them. After compressing these louder words, I can then raise up the entire level of the vocal track, so that both the soft and loud notes sit comfortably within the rest of the mix. While I will cover many compression techniques throughout this course, this technique is one of the most common uses of compression.
- Measuring amplitude
- Understanding dynamic range
- Introducing compressors
- Utilizing compression ratios
- Applying attack and release
- Evening out a vocal performance with compression
- Adding punch and sustain to drums
- Using compression presets intelligently
- How to record with compression
- Solving common mix problems with limiters
- De-essing a vocal track
- Using gates and expanders
- Controlling frequency content with multiband compressors
- Using sidechains creatively
- Keying gates and compressors
- Fixing overcompressed tracks
- Using mixbus compression
- Working with parallel compression
- Compression and limiting best practices