DigiTech RP21D manual Parametric Equalizers, Parametric Equalizer Parameters

	RP21D User’s Guide	Section Two - Editing Functions
Phase L - R	Inverts the phase of the left or right side of the stereo source signal. Can be set either IN or OUT of phase.
Freq	Controls the amount of boost / cut applied to the selected frequency. The GEQ 8 uses 1-1/3 octave ISO standard
	frequency centers, (Hz) while the GEQ15 and GEQ31 use 2/3 octave and 1/3 octave frequencies. Boost/cut range for
	each band is from -12 to 12.

Parametric Equalizers

Parametric EQs offer the added flexibility of letting you define the center frequency you want to adjust, and how many frequencies around that center frequency you want to affect. Some of the PEQ modules in the RP21D also include high shelf and low shelf EQ bands. A high shelf allows you select a frequency, and the boost/cut parameter changes the level of all the frequencies above that selected frequency. The low shelf works the same way but works on frequencies below the selected frequency.

Parametric Equalizer Parameters

Level	Controls the signal input level fed to the Module. Ranges from Off to 100%.
Phase	Inverts the phase of the source signal. Can be set either IN or OUT of phase.
Phase L - R	Inverts the phase of the left or right side of the stereo source signal. Can be set either IN or OUT of phase.
LoShlv Freq	Selects the center frequency of the low-frequency shelving EQ band. Ranges from 25Hz to 20kHz.
LoShlv Level	Adjusts the amount of boost or cut applied to the center frequency of the low-frequency shelving EQ band (selected
	by LOSHLV FREQ). Ranges from -12 to 12.
Band # Freq	Sets the center frequency of the selected band. 6-band PEQs have four true parametric bands of EQ plus shelving
	high- and low-frequency controls with variable frequency. Bands 1 and 2 range from 25 Hz to 20 kHz. Bands 3 and
	4 range from 1 kHz to 20 kHz.
Band # Width	Controls the bandwidth of the selected frequency. The higher the setting of WIDTH, the more frequency-selective the
	boost/cut becomes. In other words, with low (narrow) WIDTH settings, frequencies around the selected center
	frequency are not affected by the LEVEL setting. As WIDTH increases, frequencies around the center frequency
	become affected by the setting of LEVEL. Range is from 0.08 to 4.00 kHz.
Band # Level	Adjusts the amount of boost or cut applied to the selected frequency. Varies from -12 to 12.
HiShlv Freq	Selects the center frequency of the high-frequency shelving EQ band. Ranges from 1kHz to 20kHz.
HiShlv Level	Adjusts the amount of boost or cut applied to the center frequency of the high-frequency shelving EQ band (selected
	by HISHLV FREQ. Ranges from -12 to 12.

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