North Coast Synthesis - MSK 007 Leapfrog VCF


The MSK 007 Leapfrog VCF is not your average low-pass with a transistor ladder or sallen key topology. Instead, it was based on an elliptic filter design. The module’s cutoff slope is uneven and has an edge steepness of at least -61 dB per octave. Thus, the filter takes a hard grip on incoming audio material. Fast FM modulation results in roaring formant sounds. The module’s resonance is quite sharp. – Perfect support for the natural, rich sound character. While self-oscillating, the Leapfrog VCF can be used as an oscillator.


The MSK 007 Leapfrog VCF is a quite unusual low-pass filter. Instead of one cutoff potentiometer, there are coarse and fine tune knobs. The manually as well as voltage controllable VCA, which usually determines the strength of the resonance, can be placed behind the filter circuit. Linear and exponential FM inputs with attenuators allow you to influence the VCF’s cutoff frequency. A special treat are audio rate modulations, which lead to very cool formant sounds.

The main feature, however, is the Leapfrog’s five-pole elliptic filter design. Its slope is slightly uneven and has an edge steepness of at least -61 dB per octave. The module’s basic character is somewhat rough. Small ripples in the frequency response, which occur in front and behind the cutoff point, give the MSK 007 a very musical sound. Its sharp, but not deafening resonance supports the module's fascinating, hearty character very well. While self-oscillating, the Leapfrog VCF can be played tonally over a range of several octaves. Thanks to temperature compensation, the pitch tracking is very accurate.

The MSK 007 is built using through-hole components.


Audio input and output
Linear and exponential FM input
1 v / octave input
VCA CV input


3U Eurorack module, 16 HP wide, 55 mm in depth
Power consumption: 70 mA at +12 V and 65 mA at -12 V

0.2 kg
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