Key data

Dual multimode filter

Parameter Value
Width 18HP
Depth 25mm
+12V current 150mA
-12V current 140mA
Lifetime 12/20 to 04/22
Modulargrid Link

Original printed manual

PDF download


An essential overdrive circuit

  • A CV-controlled overdrive stage precedes each of the two filters.
  • Overdrive response continuously adjustable between soft-clipping and 2-stage wavefolding.

Two rich multimode filters

  • Clean 2-pole (12dB/octave) state-variable design.
  • CV-controlled filter response, continuously variable between low-pass, band-pass and high-pass.
  • CV inputs with attenuverters for cutoff and resonance.
  • Unattenuated frequency CV input, calibrated for 1V/Oct tracking.
  • Clean self-oscillation across the audio range, extending into very low frequencies, with constant amplitude.
  • Modulating the filter response is akin to modulating the phase of the self-oscillation tone.

Unique routing possibilities

  • Continuously variable (and CV-controlled) routing from single to parallel to series.
  • With a signal patched into filter 2's audio input, the routing knob and CV act as a crossfader.
  • Filter 2's cutoff can be set relatively to filter 1's cutoff.


  • Fully analog, based on the V2164 quad VCA chip.
  • Frequency knob range: 8Hz to 18kHz.
  • Audio input impedance: 30k.
  • DC-coupled audio inputs.
  • Filter mode CV input impedance: 50k.
  • Other CV inputs impedance: 100k.
  • All CV inputs handle audio-rate modulations.