Knee
From WikiRecording
Knee refers to the shape of the curve at or around the threshold, a soft knee will usually engage within 10 dB of the threshold and begins to apply compresssion at a low ratio increasing gradually until the set ratio when the signal hits the threshold point. Image is the blow up of the square in the previous one. Remember that the knee is different from attack, but that they are related. A soft knee will reduce the percieved change from uncompressed to compressed signal especially at high ratios but a hard knee can be used for effect.
Hard Knee means the curve is sharp, providing near-instantaneous compression above the threshold.
Soft Knee means the curve is rounded, and the onset of the compression around given threshold is more gradual resulting in a more subtle and less percievable sound.
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