Filter

Removes highs, lows, or everything but a band around the cutoff

Open in the synth with a demo patch Open Modular

What it does

A filter cuts away part of the spectrum: low-pass keeps everything below the cutoff and makes the sound darker and softer, high-pass keeps everything above it and leaves only a whisper, and band-pass keeps a narrow slice around it. Cutoff is the frequency where that boundary sits; Q (resonance) emphasises the frequencies right next to it and starts to sing at high values. The Cutoff input lets something else move that boundary, an LFO for instance.

Try this

Lower Filter cutoff after Oscillator to take the edge off the high frequencies.

Ports

in: Audio in
cutoff: CV on the cutoff frequency
out: Audio out

Parameters

Mode · Cutoff · Resonance

Try this

A saw from a Drone through a low-pass at 400–800 Hz: that is how a saw turns warm and syrupy.
Patch LFO → Cutoff and play with the cable amount: 0.2 is a gentle breath, 0.6 a clear “wah”.
Band-pass with Q around 8 on noise sounds like wind whistling through wires.

Other modules

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