SAMPLED

Synthesis and sound design · updated 2026-08-16

FILTER (VCF)

Removes or emphasises frequencies. Low-pass filters are the classic; resonance boosts the band right at the cutoff.

Close-up of a Eurorack modular synthesizer: oscillator, filter and envelope modules wired together with patch cables, showing the signal path these synthesis terms describe.
Synthesis and sound design — Close-up of a Eurorack modular synthesizer: oscillator, filter and envelope modules wired together with patch cables, showing the signal path these synthesis terms describe.

Photo: Eurorack Modular Synthesizer Closeup (opens in a new tab) by Nir Yaniv (opens in a new tab), via Wikimedia Commons — CC BY-SA 4.0 (opens in a new tab)

Key takeaways

  • Removes or emphasises frequencies.
  • Low-pass filters are the classic; resonance boosts the band right at the cutoff.
  • Low-pass is the workhorse, resonance emphasises the corner frequency, and slope (12 dB versus 24 dB per octave) is a large part of why different synths have distinct characters.
  • Route an envelope to filter cutoff with a short decay and you get the classic plucked, acid or bass-stab shape.
  • Watch out: pushing resonance to self-oscillation on a full mix bus.

Quick checklist

  • Can you define filter (vcf) in one sentence without looking?
  • Can you point at filter (vcf) in a real session, mix or contract?
  • Have you tried the practical move above at least once?
  • Would you catch the common mistake before it costs you a take?
  • Have you opened one of the primary sources below rather than a forum thread?

FILTER (VCF) IN DEPTH

The filter removes or emphasises parts of the harmonic spectrum. Low-pass is the workhorse, resonance emphasises the corner frequency, and slope (12 dB versus 24 dB per octave) is a large part of why different synths have distinct characters.

How it works in practice

Route an envelope to filter cutoff with a short decay and you get the classic plucked, acid or bass-stab shape.

The mistake people make

Pushing resonance to self-oscillation on a full mix bus. It creates a sine tone at the cutoff that reads as a mix problem, not a sound design choice.

WHERE FILTER (VCF) SITS

Filter (VCF) belongs to synthesis and sound design in the Sampled music glossary. How synths make sound, in the order the signal actually travels.

TERMS THAT DEPEND ON FILTER (VCF)

  • Nyquist frequency

    Half the sample rate — the highest frequency a digital system can represent. Above it, content folds back as aliasing, so converters filter it out.

  • Envelope (ADSR)

    Attack, decay, sustain, release — how a parameter moves over the life of a note. Applied to volume, filter, pitch, anything.

  • Subtractive synthesis

    Start with a harmonically rich waveform and filter material away. The architecture behind most classic analogue synths.

  • Polyphony / paraphony / monophony

    How many notes a synth can play at once, and whether each note gets its own full voice path or shares a filter.

  • Velocity sensitivity

    How hard a key is struck, sent as a MIDI value and usually mapped to level and filter brightness so playing dynamics survive.

  • Oversampling

    Running a process at a multiple of the project sample rate so distortion products land above the audible band before being filtered out.

TEST YOURSELF

0/3 answered · 0 correct

3 quick questions on filter (vcf). Answers are marked instantly — nothing is sent anywhere.

  1. 1. Which statement best describes filter (vcf)?

  2. 2. What is the mistake people most often make with filter (vcf)?

  3. 3. In practice, which of these applies to filter (vcf)?

Ready for the full thing? Take the 25-question terminology test and get a certificate with your name and score.

SOURCES AND CITATIONS

Free, primary references for filter (vcf) — standards bodies, manufacturers, government offices and university course material. Each one lists the line of this entry it backs up.

  • Ableton — Learning Synths (opens in a new tab)

    Manufacturer learning resource · Ableton

    “Removes or emphasises frequencies.”— the claim this source supports

    Why it counts: A free, hands-on explainer from a DAW maker — useful for hearing the concept rather than only reading it.

  • Korg — product manuals (opens in a new tab)

    Primary reference · korg.com

    “Low-pass filters are the classic; resonance boosts the band right at the cutoff.”— the claim this source supports

    Why it counts: Published by the organisation responsible for the thing being defined, so it is a first-hand source rather than a summary of one.

RELATED TERMS IN SYNTHESIS AND SOUND DESIGN

Back to the full music glossary or read our latest articles.