How Does It Work?#

Limiter is a stereo brickwall limiter with adjustable threshold and ceiling, optional external sidechain detection, lookahead, and a switchable soft-clip stage.

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Quick Overview#

• Stereo program inputs: In L and In R.
• Optional stereo sidechain inputs: SC L and SC R.
• Separate Threshold and Ceiling controls.
• Lookahead helps catch fast transients before they overshoot.
• The panel includes a live scope with a visible ceiling reference line.

Inputs And Outputs#

Port	Type	What It Does
In L	Audio input	Left program input.
In R	Audio input	Right program input.
SC L	Audio input	Left external sidechain input.
SC R	Audio input	Right external sidechain input.
Thr CV	CV input	Bipolar threshold modulation. ±5V maps to about ±24 dB.
Ceil CV	CV input	Bipolar ceiling modulation. ±5V maps to about ±12 dB.
Rel CV	CV input	Bipolar release modulation around the panel release setting.
Mix CV	CV input	Bipolar dry/wet modulation around the panel setting.
Out L	Audio output	Left limited output.
Out R	Audio output	Right limited output.

Controls Reference#

Control	Range / Values	Default	Behavior
Threshold	-48..0 dB	-8 dB	Start point for limiting action.
Ceiling	-24..0 dB	-1 dB	Final output ceiling target.
Attack	0.05..20 ms	1 ms	Attack time for gain reduction.
Release	10..2000 ms	120 ms	Release time for gain reduction.
Knee	0..12 dB	2 dB	Soft-knee width around the threshold.
Lookahead	0..10 ms	2 ms	Delay applied so the limiter can react before peaks reach the output.
SC HPF	20..500 Hz	120 Hz	High-pass filter on the detector path.
Mix	0..1	1	Dry/wet blend.
SC Drive	0..12 dB	3 dB	Drive amount for the soft-clip stage.
Link	Off, On	On	Links stereo channels for shared limiting behavior.
Auto Rel	Off, On	On	Adapts release timing to limiting depth.
Soft Clip	Off, On	On	Enables the pre-limiter soft-clip stage.

Behavior Notes#

• If no sidechain cable is connected, the limiter detects from the main program input.
• If only one sidechain side is patched, that signal is reused to keep the detector path complete.
• Ceiling is the limiter's output target, and the panel scope draws it as a reference line.
• Soft Clip inserts a saturating stage before the brickwall action. SC Drive only matters when soft clipping is enabled.
• Mix supports parallel limiting directly inside the module.