The detection section:
The detection section should be familiar to de-esser and compressor users.
It has three parameters : Reduction, Response and Frequency.

• Reduction : The reduction parameter controls the sensivity of the detection; higher settings mean that more sibilants will be detected, but too high a setting may mean that some non-sibilants are mistakenly detected too. In other words, the reduction parameter adjust how the input signal is split into sibilant and non sibilant signals. In order for this control to have an effect on the sound, you must set up a sibilant gain or equalization. Without sibilant gain or equalization, the output remains identical to the input signal.
  
• Response : it is unusual to find a response time parameter in a de-esser, but it is actually quite useful. You can use it to adjust the responsiveness of the detection, and adapt it to your vocal track, or even automate it with respect to the various parts. The more responsive the detection, the more precise the response. Fast response times may result in an unnatural sound, however, so do experiment with this setting. Use fast response times for precise isolation of sibilants, and slower ones for smoother transitions.
  
• Frequency : The detection frequency is useful in isolating sibilants. Use the listen switch to adjust the high pass filter used in the Detection section.
  
• Amount Vu Meter : Displays the reduction amount. When all the LEDs are off, the sound is only processed by the Voiced section of the E²Deesser. When the Vu Meter is fully lit, the sound is processed only by the Sibilants section. The Amount control allows the Sibilant and Voiced sections to be mixed.
  
• Listen : When switched on, you can listen to the output of the detection filter. It is useful when adjusting the detection frequency with respect to your track.