4 HP
38 mm deep
Current Draw
92 mA +12V
82 mA -12V
0 mA 5V
$189 Price in €

This Module is currently available.

4p / 2p state-variable filter with input saturation, output wavefolding, and more

C4RBN (pronounced "Carbon") is a 4/2-Pole State Variable Filter with input saturation, output wavefolding, and more. It features a wide range of character from nice and clean filter sounds to screaming, squelchy, acidic mayhem.

C4RBN builds on WMD’s history with state-variable filters (uHadron Collider, Protostar, MMF) adding interface refinements and improved warm environment stability for live performance and beyond. A novel input saturation circuit plus the output wavefolder from WMD’s classic SYNCHRODYNE filter pair together to push the timbral flexibility to the next level. C4RBN is the building block to life in your eurorack.

- 3 independent 2 pole outputs for High Pass, Low Pass, and Bandpass
- Inverting Attenuator (attenuverter) for FM allows for positive and negative CV control over the cutoff frequency
- Independent 4 Pole output with switchable frequency response
- Input Saturation with 3 switchable levels and CV input for additional fine control
- PING circuit generates a fast decay envelope emulating the response of a vactrol
- Output wavefolder for extra bite and screaming character
- Resonance with self oscillation
- Temperature compensated 1V/Oct tracking.
- Performance focused control scheme allows for on-the-fly changes of filter types with intention

Size: 4hp
PCB height: 112mm
Depth: 38mm (with cables)
Power: +92mA, -82mA
Audio Input: 100k ohm impedance
20Vpp range
V/Oct Input: 82k ohm impedance
Temperature Compensated
CV Inputs: >100k ohm impedance
Filter Outputs: 1k ohm impedance
20Vpp range


Ø 4.73 (49 Votes) Average Rating
submitted Jul 8th 2020, 16:04 by WMD | last Change May 9th, 14:12 by code_and_coffee