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Ikarie is a uniquely sculpted, flexible stereo or dual peak filter module. It can continuously transition between lowpass and highpass filtering with a single knob. It also packs in an envelope follower for the incoming audio signal, which comes in handy when you're looking to increase your sound's internal animation.

Two parallel filter cores can be modulated in sync for work in the stereo realm, set apart for unique stereo effects (with either mono or stereo signal at the base), or chained together to make a 24 dB filter.

With only the mono output of the filter used, Ikarie behaves as a dual peak filter, which evokes formant-type sounds and rich, at will piercing, throaty resonance. The Beyond output gives you the spectral difference of the two filters, effectively turning the unit into a so-called twin peak filter.

Add an internal VCA, CV control over panning and resonance, optional overdrive of the input, and you can explore a vast universe of sound design possibilities, from liquidy through pinged percussive to lush and eerie. All in a very compact form factor, with tons of space for precision and creativity.

This module results from a collaboration between Václav Peloušek of Bastl Instruments and Peter Edwards of Casperelectronics. While Edwards' obsessive attention to detail gave this filter a uniquely balanced resonance and envelope response, the expertise of Peloušek delivered a one-hand user experience filter with a distinctive control scheme at a minimal footprint.


  • Two parallel filter cores (left and right)
  • Based on 12dB/oct state variable filter topology
  • Unique lowpass/highpass switching control scheme
  • Well balanced voltage controlled resonance circuit
  • Envelope follower with 3 decay settings
  • Input gain up to 5 times
  • Stereo modulation - either panning of filter detuning
  • Flexible patch programmable topology
  • Beyond output for difference spectrums (twin peak filter)
  • Modulation attenuverter
  • V/Oct input with scaling trimmer accessible from the front panel
  • Output stereo VCA
  • Power consumption: +12V: 100mA, -12V: 95mA
  • 8HP
  • 35mm
  • PTC and fuse protected 16pin power connector

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