The Touellskouarn “Sil Kontrollet” eurorack module is a LowPass voltage-controlled filter (VCF)  The filter is a 12dB per octave low-pass filter that can be self-oscillated, this way it can produce a sine wave with V/Oct tracking capability. This filter has a unique and distinctive sound, characterized by its aggressive resonance and its ability to self-oscillate. Cutoff can be cv controlled. The module is 6HP wide and is made with quality components such as Nichicon/Panasonic caps and alpha pots.