Final Cut Pro X Logic Effects - Setting the Compressor Knee

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Setting the Compressor Knee

The Knee parameter determines whether the signal is slightly, or severely, compressed
as it approaches the threshold level.

Setting a Knee value close to 0 (zero) results in no compression of signal levels that fall
just below the threshold, while levels at the threshold are compressed by the full Ratio
amount. This is known as hard knee compression, which can cause abrupt and often
unwanted transitions as the signal reaches the threshold.

Increasing the Knee parameter value increases the amount of compression as the signal
approaches the threshold, creating a smoother transition. This is called soft knee