Tony M Feb 12, 2013:

gain / cut In something like a parametric equalizer, once you have chosen the values for the filter type, frequency, and Q parameters, you can usually also adjust the extent to which the filter cuts or attenuates signals at a certain frequency (band stop filter), or boosts or amplifies them (band pass) — and of course, like most tone controls etc., it will have a neutral or '0' position where it allows the signal to pass with its level unchanged.