Audio compression is a fundamental technique in EDM production, and understanding the technical differences between various compression types, along with their specific parameters, is key to effectively shaping the dynamics and overall sound. Compression, at its core, reduces the dynamic range of an audio signal, making the louder parts quieter and the quieter parts louder, which helps to make tracks sound more consistent, powerful and punchy. However, different compression types accomplish this in their own ways, resulting in distinct sonic characteristics.
One of the most common types of compression is VCA (Voltage Controlled Amplifier) compression. This type of compressor generally offers a clean and transparent sound with a more linear response, making it suitable for general-purpose dynamic control. The parameters associated with VCA compression are typically:
- Threshold: This parameter sets the level at which the compressor begins to engage. Signals exceeding the threshold are compressed.
- Ratio: This parameter determines the amount of gain reduction applied. For example, a 4:1 ratio means that for every 4dB of signal exceeding the threshold, only 1dB is allowed through.
- Attack: This parameter controls how quickly the compressor begins to compress the signal. A fast attack will clamp down quickly, while a slow attack allows more of the initial transient to pass through.
- Release: This parameter determines how quickly the compressor stops compressing after the signal falls below the threshold. A fast release will return the signal to normal quickly, while a slow release will maintain the gain reduction longer.
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