Single-Band EQ can operate in several modes. When you choose an EQ type with the EQ Mode buttons, the controls shown below the buttons update to provide functions appropriate to the EQ type.
Mode buttons: Choose an EQ type.
Low Cut: Low Cut EQ attenuates the frequency range that falls below the selected frequency.
Low Shelf: Low Shelving EQ affects only the frequency range that falls below the selected frequency.
Parametric: Parametric EQ is a simple filter with a variable center frequency. It can be used to boost or cut any frequency band in the audio spectrum, either with a wide frequency range or as a notch filter with a very narrow range. A symmetrical frequency range on either side of the center frequency is boosted or cut.
High Shelf: High Shelving EQ affects only the frequency range above the selected frequency.
High Cut: High Cut EQ attenuates the frequency range above the selected frequency.
Frequency knob and field: Set the cutoff frequency.
Gain knob and field: Set the amount of cut or boost. Available only for Shelf and Parametric EQs.
Slope knob and field: Choose the amount of cut, in decibels per octave. The higher the value, the more pronounced the effect. Available only for Low Cut and Hi Cut EQs.
Q Factor knob and field: Set the width of the frequency band around the cutoff frequency.