Digisound module 80-7 VC State Variable Filter


  • Octaves
  • Fine
  • Signal 1
  • Control 2
  • Function
    switches between:
    • 2-pole (12dB/octave) Low Pass (LP2)
    • 2-pole (12dB/octave) Band Pass (BP2)
    • 2-pole (12dB/octave) High Pass (HP2)
    • 2-pole (12dB/octave) Notch (N)
    • 4-pole (24dB/octave) Low Pass (LP4)
    • 4-pole (24dB/octave) Band Pass (BP4)
    • 4-pole (24dB/octave) High Pass (HP4)
  • Resonance


  • C1
    frequency control CV input 1
  • C2
    frequency control CV input 2
  • Res.
    resonance CV input
  • S1
    audio input 1
  • S2
    audio input 2
  • S3
    audio input 3
  • Out1
    audio output 1
  • Out2
    audio output 2



Voltage Controlled State Variable Filter based on CEM 3320 with CEM 3335 used as a controlled feedback amplifier.

Seven switchable responses: 2-pole, (12dB/octave) Low Pass, Band Pass, High Pass and Notch plus 4-pole (24dB/octave) Low Pass, Band Pass and High Pass. Exponential voltage control at 1V/octave. Manual and external control of resonance (but no self oscillation).

The original model 80-7, based on the SSM 2040, was replaced by the CEM-based 80-7A with the same features.

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