Cubusynth – Dual CS-20 VCF – Full DIY Kit

£103.00 (Excl. VAT)

Dual / stereo multimode VCF with self-oscillating resonance and intuitive routing and CV modulation matrix

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SKU: Kit_Cubusynth_Dual_CS-20 Categories: , , , Brand: HP Size: 10 HP


The CubuSynth Dual CS-20 VCF is a dual multimode VCF inspired by the legendary Korg MS-20, with CV control over frequency and resonance. The resonance can self-oscillate and features a 1V/Oct input, stable over at least 2~3 octaves.

Each of the two filter cores features 2 stages of Low Pass and High Pass filtering, which can be blended together. The Frequency CV input features a dedicated attenuverter and  the resonance CV  also comes with its own attenuator.

Each of the two filter cores consists of a two pole (12db) Filter with a “LP/HP Blend” knob, which lets you choose the Filter-Mode from Low-Pass through a kind of Notch/Phaser mode, to High-Pass. The Qcv attenuator controls the amount of the incoming CV signal for Resonance. This CV input is normalled from the frequency CV input (visible by the silver arrows on the front panel).

While the resonance is in self-oscillation, you can use the output of one Filter, to modulate the other one (and/or itself). This will result in very unexpected (especially for a filter), glitchy FM sounds. To not have the Output from OUT1 normalled to the IN2, you can plug a cable or Jack connector into IN2.


  • 2 individual Filter cores with common Frequency and Resonance controls
  • CV control over Frequency and Resonance for each Filter core
  • Self-oscillating Resonance with LED feedback circuit (visible on the Front)
  • 1 V/oct input, tracking over 2~3 octaves
  • Frequency Range: 22 Hz – 20 kHz
  • Blend between LP / HP Filter modes
  • Ability to use as 2 pole (12db) stereo HP/LP Filter, 4 pole (24db) mono LP/HP or a Band Pass (12db) Filter
  • Cross FM Modulation possible


  • Width: 10HP
  • Depth: 36mm
  • Power Consumption: +12V: +19mA, -12V: -19mA

Dual CS-20 VCF – Build Document | User Manual

Additional information

Weight 0.172 kg
HP Size

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