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The Spectral Compressor is a dynamics processor that allows you to apply compression selectively across 18 frequency bands. These compression bands can either be spread out across the full range of the spectrum, or focused on a specific frequency range for more precise control.


The Spectral Compressor includes the following features:

Controls

Threshold

The slider attached to the input meter on the left is the Threshold control. The Threshold sets the input signal level where the overall compression begins to take effect. The Threshold can be set anywhere between -60 and 0 dB.

Frequency Range

The Frequency Range section allows you to select the specific frequency range that gets processed by the compressor. The 18 compressor bands will be distributed across whatever range is selected. For example, with Mid selected, all 18 bands will be focused on the Mid range, allowing for more precise control over the frequencies within that range.

The available Frequency Range options are as follows:

Full Range 16 Hz - 20 kHz
High 3 kHz - 20 kHz
High Mid 200 Hz - 18 kHz
Mid 180 Hz - 7 kHz
Low Mid 12 Hz - 8 kHz
Low 15 Hz - 500 Hz

Depth Controls

The 6 sliders below the graph set the Depth for their corresponding bands. The 18 compressor bands are divided among the 6 sliders so that each slider controls the Depth for 3 of those bands.

The range of frequencies affected are shown below each slider.


The Depth determines the maximum amount of Gain Reduction that can be applied within each slider’s control range. Possible Depth values range from -24 to 0 dB. Setting a Depth slider to 0 dB will prevent any attenuation from occurring within that slider’s control range.

Knee

The Knee value determines how far the input signal must exceed the threshold in a given band, to incur the full depth for that band. Possible Knee values range from 1 to 30. With a low Knee value (Hard Knee), the compression will activate more abruptly as the signal passes over the Threshold. A high Knee value (Soft Knee) will apply the gain reduction more gradually as the signal passes the threshold.

Output Trim

The Output Trim adjusts the level of the compressor’s output signal anywhere from -10 dB to +10 dB. It can be used to increase or decrease the output level as needed for gain compensation.

Control Behaviors & Shortcuts

Various mouse & keyboard shortcuts can be used to perform certain actions on the following controls:

Labels

Action Shortcut
Reset to default Alt-click
Fine adjust Shift-click & drag
Control-click & drag (Windows only)
Command-click & drag (OSX only)
Adjust value Scroll mouse wheel
Close editor (discarding changes) ESC
Close editor (submitting changes) Enter


Slider/Knobs

Action Shortcut
Reset to default Double-click
Alt-click
Fine adjust Shift-click & drag
Control-click & drag
Command-click & drag (OSX only)
Adjust value Scroll mouse wheel

Gain Reduction Graph

The Gain Reduction Graph provides a visual representation of Gain Reduction across the frequency spectrum. The Reduction curve (red) is displayed above the Input curve (orange-yellow) indicating the amount of Gain Reduction applied and its location along the spectrum. The red line inside the Input curve indicates the level of the compressed signal relative to the input signal.


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