The Parametric Equaliser allows for control over the amplitude and centre frequency of a specific frequency range. Parametric equalisation might be used for a number of reasons, tonal enhancement (enhancement of a certain frequency range), to remove excess resonance, noise reduction or to combat unwanted sounds.
frequency - Allows for definition of the effects centre frequency.
gain - Allows adjustment of the amplitude within the specified frequency range.
bandwidth - Allows definition of the width of the frequency range.