Multimode filter based on the 2-pole OBx-a filter.

Tomatek-Audio MMVCF.

a High-end AS3320 based 12dB-per-Octave multi-mode filter module. With separate outputs for Low-Pass, Notch, Band-Pass and High-Pass. Based on the design of the 2-pole OBx-A filter, but with several tweaks and improvements.


  • CV control over Filter-Cutoff and Resonance, with a fixed V/Oct input, switchable attenuation/attenuversion on the FM-input and attenuation on the Resonance CV input.

  • Self-Oscillation with accurate temperature compensated V/Oct tracking over approximately 6 octaves, which allows for a very nice playable sine wave.

  • Input gain control with a soft-clipping circuit that kicks in at around the 12o'clock setting, with typical eurorack levels. Allowing for clean tones till unity-gain and soft-clipping and eventually hard-clipping the filter front-end at higher gain settings. When used in conjunction with a VCA before the filter, this will allow for a nice range of extra tones.

  • Makes use of high quality parts where applicable (Wima Polypropylene capacitors for timing, Nichicon Bi-polar audio capacitors for ac-coupling, Panasonic and Nichicon electrolytics, Texas Instruments Audio-Grade Op-amps and of course ALFA AS3320 filter chip).

  • 8HP width.

  • Skiff friendly at 35mm deep.

  • Made with love in Amsterdam!

The boxed module will include a 16-pin power cable and a set of screws and washers.

audio demo's can be found below, more demo's and tutorials will follow shortly! :


  • 25 mA +12V
  • 25 mA -12V
  • 0 mA 5V
  • 35 mm deep
  • Ø 4.67 (3 Votes) Average Rating

This Module is currently available.

$193 Price in € submitted Apr 20th 2020, 15:36 by TomaTekAudio | last Change May 23rd 2020, 21:58 by TomaTekAudio
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