Dynamics Plug-Ins : Channel Strip : Input : Input Trim Control

Input Trim Control
The Input Trim control sets the input gain of the plug-in before EQ processing, letting you make up gain or prevent clipping at the plug-in input stage.
To Trim the input signal, do one of the following:
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Click in the Input Trim field to type the desired Trim value (–36.0 dB to +36.0 dB).
– or – 
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Click Trim and drag up or down to adjust the Input Trim setting.