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User Guide - MPC Spectral Compressor

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Introduction

 

The MPC 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 MPC Spectral Compressor includes the following features:

 

  • Master Threshold control
  • Frequency Range selection
  • Band Depth controls
  • Gain Reduction graph
  • Compressor Knee
  • Output Trim

 

Overview

The Depth sliders below the graph control the maximum amount of gain reduction that can be applied to the corresponding frequency bands determined by the current Range setting. The Range can be set to focus on specific areas along the frequency spectrum (Low, Mid, High, etc.), or it can be set to Full Range mode to allow control over the entire spectrum. The Threshold sets the input signal level where the overall compression begins to take effect. Additional controls include compressor Knee and output Trim.

 

 

Controls

Threshold

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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

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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 Controlsimage4.png

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

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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

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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

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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.