How Does It Work?#

Ladder LPF is a 4-pole transistor ladder lowpass filter with the classic dense, rounded ladder tone and a broad resonance range.

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Quick Overview#

• Ladder LPF is a classic single-input, single-output lowpass filter.
• It provides Cutoff and Q controls plus dedicated CV inputs for both.
• The cutoff range is 20 Hz to 20000 Hz.
• Resonance ranges from 0.7072 to 25.
• Its 4-pole slope is steeper and darker than Ladder Half.

Inputs And Outputs#

Port	Type	What It Does
In	Audio	Signal fed into the ladder filter.
Cut	CV	Modulates cutoff frequency.
Res	CV	Modulates resonance (Q).
Out	Audio	Filtered lowpass output.

Controls Reference#

Control	Range	Default	Behavior
Cutoff	20..20000 Hz	20000 Hz	Sets the lowpass cutoff frequency.
Q	0.7072..25	1	Sets resonance around the cutoff.

CV Behavior#

• Cut uses exponential modulation, which is useful for envelope and keyboard-style tracking.
• Res uses linear modulation and is clamped to the supported resonance range.
• The filter smooths parameter changes internally to avoid zipper noise during motion.

Character Notes#

• This is the fuller and heavier ladder voice in the group.
• Compared with Ladder Half, it removes highs more aggressively.
• There is no dedicated drive parameter, so hotter input levels are the way to push the core harder.