12 HP
25 mm deep
Current Draw
35 mA +12V
30 mA -12V
0 mA 5V

This Module is discontinued.

Specs are approved by the manufacturer

3-pole 18dB state variable filter

Altar is a voltage controlled 3-pole, 18dB/octave state variable filter.

The configuration of the filter can be smoothly crossfaded from BP to LP to HP. This unusual filter type arrangement brings out very nice harmonics and nuances. It is really suited to CV control. The CV input has an attenuverter.
Resonance is under voltage control with attenuverter as well allowing for great timbre modulations. It is particularly useful to recreate accent patterns à la 303. There is a gain at Altar input to beef up your signal which then distort the filter core. The filter tracks 1V/oct for 4-5 octaves and can turn into a very sweet sine oscillator. Try using it with Miasma as a waveshaper!


  • Gain control to distort the filter core
  • Color to go from band pass to low pass to high pass filter
  • Resonance
  • Frequency with 1V/Oct
  • Attenuverters on Color, Resonance and Frequency CV

Technical characteristics

  • 3-pole filter
  • 18dB/oct cut
  • 1V/Oct with calibration trimmer on the PCB, tracks up to 4-5 octaves


Ø 4.70 (10 Votes) Average Rating
submitted Nov 16th 2018, 14:41 by Terdjman | last Change Oct 30th, 13:12 by Terdjman

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