Low-pass filter

A gentle one-pole filter for warmer edges.

Filter
Since 0.1.0
filter
tone
warm

Low-pass filter as the Patch draws it, at default values: inlets on the left, outlets on the right.

A simple filter that lets low frequencies through and softens high ones. It is the quickest way to make a sound warmer or darker.

What it does#

A one-pole low-pass filter reduces everything above its cutoff gently, at about 6 dB per octave. It has no resonance, so it never rings or whistles. It is applied to every channel of the incoming audio.

When to use it#

Use it to take the edge off a bright source, to tame a harsh distortion or to darken feedback inside an echo. When you need resonance, a steeper slope or other filter types, use the Filter.

Ports#

Port	Direction	Signal	Lanes
`audio`	Input	Audio	Inferred from the cable
`audio`	Output	Audio	Inferred from the cable

Parameters#

Parameter	Label	Range	Default	Unit	Scale	Notes
`cutoff`	Cutoff	40 to 18000	3200	Hz	log	Sets the low-pass cutoff frequency. Lower values soften high frequencies.

Cutoff (`cutoff`)#

The frequency, from 40 to 18000 Hz, above which the sound is gradually reduced. The control is logarithmic, so each step covers a similar musical distance.

Tips#

Cutoff is a gradual slope, not a wall: sounds well above it are quieter, not gone.
Place it before an effect to darken what feeds the effect, or after to darken the result.
For a sweep with a peak, use the Filter instead.

Help patches

Each help patch is an ordinary Toy that teaches one idea. The diagram shows the Patch; the preview shows its Frame. Open it in TuneToys to play and edit it.

1. Darken a sound with cutoff

beginner Teaches: cutoff

A bright saw wave softened by a one-pole low-pass filter.

Patch: Oscillator audio output connected to Low-pass filter audio input. Low-pass filter audio output connected to Patch outputs audio input.

Connections as text

Oscillator audio output connected to Low-pass filter audio input
Low-pass filter audio output connected to Patch outputs audio input

Lower the cutoff and the upper harmonics of the saw wave fade away.

Frame preview (static). Controls show their default values.

Open in TuneToys

Filter Low-pass, high-pass, band-pass, notch, all-pass or morphing filter with resonance, 12/24 dB slopes, curve editing and output RTA.
Drive Four nonlinear shapers with DC removal, tone and latency-aligned filtered oversampling.
Delay Tempo-aware, smoothly retimed echoes with colored, ducked and explicit multichannel feedback.