The interface of FabFilter Pro-L 2 is designed to eliminate clutter while providing as much
information as possible. It consists of the following elements:
Real-time level display
The real-time moving level display shows you at a glance what's happening to your audio. It
shows input (gray / light blue), output (dark blue) and gain reduction (red) levels, together with the
loudness level (thin line). In addition, peak labels are shown for the most significant gain reduction peaks. See Metering and Loudness
The Gain slider is the most important control: it adds gain to the incoming signal to make it
louder, while limiting to the maximum output level specified in the bottom bar. See Knobs and gain slider and Recommended
The output level meter, gain reduction meter and large loudness metering on the right provide
an immediate overview of the current levels, together with accumulating level readings above the
meters. The metering options at the left bottom of the output level meter offer various metering
scales (including Loudness, K-12, K-14 and K-20 scales) and an option to enable/disable
true peak metering. See Metering and
The advanced settings panel lets you customize FabFilter Pro-L 2's behavior by selecting
different limiting styles and tweaking their settings. See Advanced settings.
True Peak Limiting
With True Peak Limiting enabled, the true peak output is ensured not to exceed the
currently set Output Level in dBTP. See True peak limiting.
The Oversampling setting sets the amount of internal oversampling, which reduces aliasing and
generation of inter-sample peaks at the cost of additional CPU usage. See Oversampling.
Dithering and noise shaping
The Dither and Noise Shaping settings specify whether and how the output signal is dithered.
Dithering helps to preserve (perceived) detail and resolution by reducing quantize distortion.
See Dithering and noise shaping.
Input and output options
On the far right of the bottom bar, you can bypass the entire plug-in, adjust the final
output level or enable Unity Gain, Filter DC Offset, Side Chain Triggering or
Audition Limiting. See Input and output options.
The resize button in the lower-right corner lets you choose an interface size and switch to Compact mode. See Full Screen mode and resizing.
MIDI Learn lets you easily associate any MIDI controller with any plug-in parameter. See
Presets, undo, A/B, help
With the preset buttons, you can easily browse through the factory presets or save your own
settings so you can re-use them in other songs. The Undo, Redo, A/B and Copy buttons at the top
of the plug-in interface enable you to undo your changes and switch between different states of
the plug-in. Finally, the Help menu provides access to help and version information. See
Loading presets and Undo,
redo, A/B switch.