klavis-grainity

Klavis Grainity

Analog granular filter that grows harmonics from your signal

10 HP Eurorack module

The Grainity is a digitally-controlled, fully analog granular and multimode VCF that cycles through predefined filter and phase combinations in sync with the incoming audio signal's zero-crossings, creating subharmonics, harmonies, unison, flanging, and formant filtering simultaneously. It features two parallel filter paths — a unique granular VCF and a conventional multimode VCF — each with dedicated outputs plus a mixed output, offering an unprecedented palette of harmonic expansion and spectral manipulation from a purely analog audio path.

Features

  • Unique granular VCF concept based on cycling through filter/phase structures in sync with audio zero-crossings
  • 100% analog audio signal path from input to output
  • Two simultaneous filter sections: Granular VCF and Multimode VCF with separate outputs
  • Mix output with knob and CV blending both filter sections
  • Phase inversion switching between the two filter sections
  • Shared frequency (F fader, V/Oct, FM) and resonance (Q) controls for both sections
  • Multimode VCF with LP2, LP4, HP, BP, BR, and IN (bypass) types
  • Self-resonance capability on the multimode VCF
  • Granular VCF structures: pre-programmed 2 to 8-step loops plus random structures
  • Division control (1, 2, 3, 4, 5, 8, 16, 32, 64, 128) to extend grain length
  • Phase mode: delays granular cycling trigger within each audio cycle
  • Track mode: musically detunes detected pitch to set cycling rate (x1 to x2.01)

Controls & Jacks (36)

  • Φ/Frq— Phase or Frequency shift of the granular VCF, depending on Track mode. Controls phase delay within the cycle or frequency offset.
  • Mix— Blended audio output combining multimode and granular filter signals, controlled by Mix knob and CV (gain x1 from input with open filter and
  • G.VCF— Audio output of the granular VCF section (gain x1 from input with open filter and no resonance).
  • Input— Main audio input jack for both filter sections (+/- 5V pp nominal, DC coupled).
  • Structure— Rotary encoder to select granular filter structure from predefined sequences. Hold while turning to scroll through length lists.
  • M.VCF— Audio output of the multimode VCF section (gain x1 from input with open filter and no resonance).
  • Φ/Frq— Phase or Frequency shift CV input for granular VCF, summed with Φ/Frq knob (+/- 5V).
  • Div— Division control to extend grain length and repetition rate. Display shows division value (1-128).
  • Mix CV— Mix balance CV input to blend multimode and granular filter outputs, summed with Mix knob (+/- 5V).
  • V/Oct— Volt-per-octave frequency CV input for tracking filter purposes, summed with other frequency controls (+/- 5V, 2F/Volt ratio).
  • Detect— Trigger/gate or audio input jack that supersedes the main audio input for granular cycling detection (300 mV min, rising edge, AC coupled).
  • Q— Resonance modulation CV input for both filter sections (0~5V, summed with Q knob level).
  • Type— Short press cycles through multimode filter types (LP2, LP4, HP, BP, BR, IN). Long press inverts phase between filter sections.
  • Struct— Structure selection CV input; values are summed with the encoder selection (+/- 5V).
  • FM— Frequency modulation CV input for cutoff frequency control of both filter sections (+/- 5V, summed with FM knob level).
  • Track LED— Indicator LED showing Track mode active state.
  • Div— Division CV input to decrease or increase grain division rate, summed with Div pot (+/- 5V).
  • Q— Resonance fader controlling the peak amplitude at cutoff frequency for both filter sections, includes self-oscillation.
  • FM Level— Bipolar attenuverter for FM CV input. Center (marked with dot) is zero; right increases modulation, left inverts polarity.
  • Type LED - BP— Indicator LED for 12dB/Oct bandpass filter selection.
  • Mix— Blends multimode VCF (full left) and granular VCF (full right) outputs being mixed to the Mix output jack.
  • Type LED - HP— Indicator LED for 24dB/Oct highpass filter selection.
  • F— Cutoff frequency fader controlling both multimode and granular VCF sections simultaneously.
  • Type LED - LP2— Indicator LED for 12dB/Oct lowpass filter selection.
  • Type LED - BR— Indicator LED for 12dB/Oct band rejection (notch) filter selection.
  • Type LED - LP4— Indicator LED for 24dB/Oct lowpass filter selection.
  • Display— 3-digit LED display showing structure number (first 2 digits) and division value (last digit).
  • Q Level
  • Type LED - IN— Indicator LED for bypass (unaltered input) selection.
  • Track— Toggle button to activate Track mode (frequency tracking) or deactivate for Phase control mode.
  • Φ/Frq knob— Phase or Frequency shift of the granular VCF, depending on Track mode. Controls phase delay within the cycle or frequency offset.
  • Q CV— Resonance fader controlling the peak amplitude at cutoff frequency for both filter sections, includes self-oscillation.
  • Q attenuator— Unipolar attenuator for Q CV input controlling modulation amount on filter resonance.
  • Struct CV Level— Attenuator for Structure CV input, values added to encoder selection.
  • Φ/Frq CV Level— Attenuator for Phase/Frequency CV input controlling modulation depth.
  • inv— Long press to invert phase polarity between multimode and granular filter sections. Inversion active shown by blinking on the active filter

How-To Guides

  • Save V/Oct Calibration Trim
  • Update Firmware via Audio File
  • Subharmonic Drone Generator
  • 3-Note Chord from a Single VCO
  • Organic Chorus and Flange Effect
  • Pitched Filtering of Percussion
  • Pitch-Tracked Rhythmic Filter Pattern
  • Stable Granular Filtering with Unison VCO
  • Chord Voicing via Granular Filter
  • Pseudo-Stereo Dual Filter Processing
  • Rhythmic Granular Processing of Mixed Music

Explore the interactive Grainity panel on BleepDex — tap any control to learn what it does.

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