
The Low Shelf filter boosts or cuts frequencies below the cutoff, and passes frequencies above the shelf cutoff with no change made to their gain. Use this effect to enhance or diminish any amount of low frequency material in a sound.

Low Shelf filter response characteristics at various gain levels.
Ranges from 13-20,000 Hz. Indicates the midpoint of the shelf curve. The 3 dB points are roughly at twice and half the midpoint.
Ranges from -36 to +36 dB. Determines the gain applied to the shelved frequencies.

The high shelf filter boosts or cuts frequencies above the cutoff, and passes frequencies below the shelf cutoff with no change made to their gain. Use this effect to enhance or diminish any adjustable amount of high frequency material in a sound.

High Shelf filter response characteristics at various gain levels.
Ranges from 13-20,000 Hz. Indicates the midpoint of the shelf curve. The +/- 3 dB points are roughly at twice and half the midpoint.
Ranges from -36 to +36 dB. Determines the gain applied to the shelved frequencies. TOP

This process is a one band parametric equalizer. It's a very flexible filter, capable of creating notches or peaks without influencing nearby frequencies. Select a center frequency to process, the amount of gain change and the bandwidth of the filter.

Parametric EQ response characteristics at various gain levels.
Sets the frequency to be boosted or cut, from 13-20,000 Hz.
Ranges from 1-100. Determines the width of the peak/notch. Low Q's result in wide peaks/notches, and high Q's result in sharp, resonant peaks/notches.
Controls the amount of gain applied to the selected frequencies, ranging from -36 to +36 dB.