CZ1 PD VCO Oscillator


The 3HP CZ1 module is a phase distortion oscillator in a 3HP module.

It replicates the famous PD waveform and can make resonant sweeps without a filter.

Based on the CZ-1 chip ( it features a 1V/Octave pitch input with a 5 octave range and a peak index CV input with a range of 0.2x – 16x.

Both inputs have an attenuator knob doubling as a parameter dial when the CV’s are not plugged in.

It also has a simple Gate VCA input that enables it to be used as a complete synth if you don’t have any EG and VCA modules, i.e with an analog sequencer it will perform as an acid box.

In just 3HP it is a great sounding VCO featuring West-Coast synthesis.


  • Pitch CV 1V/Oct, 5 octaves, 8 – 261Hz range.
  • Peak CV multiplier index, 0.2x – 16x range.
  • Gate input CV for standalone sequencer/keyboard play.
  • 66Khz rate Virtual Analog Engine.
  • Mono output.
  • Screen printed aluminum panel.
  • Thonkiconn Long-shaft pots and jacks.
  • Eurorack 10-pin IDC Power connector. 12v 40mA

The module is $99 including shipping.

Available at:


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