TC electronic SDN BHD M3000 - Manual (Page 55)

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De-esser
A De-esser is used for removing the sibilant sounds from
instruments and especially voices. This is done dynamically,
which means that it’s not a static EQ filter but a dynamic
filter that only cuts into the sound when the high frequencies
are loud in the material.
Threshold
When the Input level exceeds the Threshold, the De-esser
will be activated, according to the Mode parameter.
Ratio
The Ratio of the gain reduction.When the Ratio is set to 4:1
it means that for every 4dB the defined frequency range rises,
the Output level increases by only 1dB.
Attack
The Attack time is the response time that the De-esser uses to
reach the gain reduction specified by the Ratio parameter.
Example: If the Input signal suddenly increases to 4dB above
Threshold with the Ratio set to 4:1 and the Attack set to
20ms, the De-esser will use 20ms to reach the gain reduction
of 3dB.
Release
Release sets the fallback time of the De-esser, after the signal
drops below the Threshold.
Freq
Sets the center frequency of the range the De-esser should
work in.
Curve
Sets the bandwidth or Lo/Hi shelf setting of the range the
De-esser should work in.
Mode
Decides how the Threshold shall react. When set to Relative,
the Threshold will be relative to the average level of the
signal. This means that also soft signals are processed. For
signals where the average level is determined by signals
outside the frequency range set, e.g. a vocal with
sibilance, the Relative setting is useful and very musical.
When Mode is set to Absolute, the Threshold set refers to
full scale (0dB) and is therefore well suited for limiting the
maximum level in a specified frequency range, e.g. the bass.
Monitor
Monitor the Sidechain signal, and hear what the De-esser
actually removes from the main signal.
ADDITIONAL EFFECTS - DE-ESSER