Equalizer Module

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Fig 1.0 Equalizer Module Diagram

The Equalizer Module allows the user to boost or remove frequencies from a signal. This module can also be used to boost or remove frequencies from a feedback loop.

There are four Parametric Equalizers included in each Equalizer Module. The first one can be swapped for a Low-Shelf Filter. The last on can be swapped for a High-Shelf Filter.


Working with the Equalizer Module

Turning On an Equalizer

In Parameter Mode, the Equalizer Module will display controls for four separate equalizers. To activate an equalizer, start by clicking on any parameter. Inside of the popup menu, activate the equalizer that you want to use. The button 'EQ1' correlates to the leftmost equalizer.

When to Use Equalizers or Filters

Parametric Equalizer

The Parametric Equalizers should be used when a certain range of frequencies need to be either boosted or attenuated in a signal. The Bandwidth parameter will allow you to determine the size of the frequency range you will be working with, while the Pitch/Boost parameter allows you to select the center pitch and boost/attenuation level.

Low or High Shelf Filters

The Low Shelf Filter should be used when you want to either boost or attenuate the lower frequencies in a signal. Similarly, the High Shelf Filter should be used when you want to either boost or attenuate the higher frequencies in a signal.

See Module Specific Parameters below, to see how to change between equalizer / filter types.

Connecting the Equalizer Module

The Equalizer Module provides two typical AudioGL audio connections, which follow typical audio connection rules.

The Equalizer Module can be used in Feedback Loops, as described in the Connections article.

When using the Equalizer Module in a Feedback Loop, it is recommended that you modify the 'Max Boost' parameter, as outlined in the Module Specific Parameters below. By default, this parameter is set to 24 decibels. For Feedback Loops, 2 decibels of boost or attenuation is generally adequate.


These parameters are repeated for each of the four Parametric Equalizers in this module.

Parameter Range Description
Pitch / Boost
-1 to 1 in Y-Direction
0 to 136 in X-Direction

The Y-Direction controls the Boost or Attenuation level of the equalizer.

The X-Direction controls the center pitch frequency or the equalizer. Pitch values can be converted to frequencies using this chart.

In the case of a high or low shelf filter, the X-Direction controls the pitch value which the high or low shelf will be centered around.

0.1 to 10

This parameter controls the width of a Parametric Equalizer as it is applied to the signal. Raise this to a higher value if you want to adjust a larger range of frequencies. Lower the value if you only want to adjust a small range of frequencies.

This parameter does not have any effect on the Low or High Shelf Filters.

Module Specific Options

Fig 3.0 Equalizer Module Options

EQ1 - EQ4 Buttons

These buttons turn each individual equalizer on and off. In Parameter Mode, these equalizers are overlaid on top of the Module from left to right.

LS & HS Buttons

When activated, the LS button will cause Equalizer 1 to be switched with a Low Shelf Filter. Similarly, the HS button will cause Equalizer 4 to be switched with a High Shelf Filter.


This parameter controls the maximum amount of boost or attenuation for each of the equalizers / filters inside of the module. When moving the 'Pitch / Boost' Parameters to their highest or lowest values, 'MaxBoost' is the amount of boost or attenuation that will be applied to the signal.

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