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.
