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# Deesser

A Deesser is used to dynamically reduce high frequencies. The standard field of use of this plugin is the reduction of "sssss" and "shhhh" in vocal tracks. Easy Effects uses the Deesser developed by Calf Studio Gear.

Detection
Select the detection of the Sidechain signal between Peak (stronger) and RMS (smoother).

Mode
Select the operation mode between Wideband and Split. In Split mode not the full range signal will be affected by the gain reduction, but only frequencies above the split frequency will be manipulated in gain.

F1 Split
The split frequency. All signals above this frequency will affect the gain reduction (and are affected in Split mode too).

F1 Gain
It shifts the volume of the higher band. In Wideband mode it affects the Sidechain. In Split mode it also affects the processed high frequencies.

F2 Peak
Center frequency of the bell filter. It allows a more precise selection of the Sidechain signal.

F2 Level
Increases or decreases the level of the chosen F2 frequency.

F2 Peak Q
Set the quality of the bell filter. Higher values will affect a narrower frequency range. Lower values will affect a wider band.

Laxity
The reaction of the Deesser. Higher values won't affect really short peaks.

Threshold
The level above which the gain reduction is applied.

Ratio
The amount of attenuation applied to the signal.

For example, a Ratio of 2 means that if the level rises 4 dB above the Threshold, it will be only 2 dB above after the reduction.

Makeup
The gain to apply after the processing stage. In Split mode only the high band will be made up.

## References

- Wikipedia De-essing
- Calf Deesser
- LedgerNote - De-esser: The Guide for Sibilant-Free Vocal Recordings