DIRT is our new 4HP low-pass filter / effect for the Eurorack modular synth platform.

Inspired by one of our favorite ‘noisy’ filters, the DIRT is an unapologetic filter / effect that produces interesting and unique effects via the Bias knob, accessible from the front panel.

It’s not a traditional filter; it’s an effects module with filtering, ring mod effects, wave shaping and even outright brutal harmonic distortion.

DIRT likes to square things up a bit, so throw in a triangle, sawtooth, sine or other wave forms for different style effects. Even plugging a guitar (using an external amplification module) into the DIRT produces some great sounds and heavy distortion.


– CUTOFF = Cutoff Frequency

– RESONANCE = Increase the Q!

– BIAS = Set the bias correctly or not, the choice is yours

– CUTOFF CV IN = Voltage range changes depending on where CUTOFF knob is positioned. External attenuation will be needed for fine modulation. In version 2.2, the CV input is buffered.

– AUDIO IN = Audio Input

– AUDIO OUT = Audio Output
Other info:

– PCB Dimensions: 4 x 1.5 inches

– CV input impedance is 47K

– 4HP

– Power consumption: >1mA



  1. vitek says:

    hi, i got only 10k audio pot, can it be used instead of that 5k?

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