Craig Anderton's Multiple Identity Filter(tm) originally appeared in a series of ariticles in Contemporary Keyboard in 1979. It is a CEM3320-based VCF with each of the four stages operating semi-independently. Each stage has...
  • Three Filter Modes
    • Lowpass
    • Highpass
    • Allpass
  • Two frequency ranges (10:1 ratio)
  • Series/Parallel Switching

Plus voltage-controlled resonance, straight/filtered signal mixer w/phase inverter (for phasing, changing bandpass to notch, etc.) and more.

Craig was in top form--this is one tricked-out VCF.

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Just in case you don't have one...
CEM3320 & data


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