by Robin Vincent | Approximate reading time: 1 Minute
BusyCircuits MCFx2

BusyCircuits MCFx2  ·  Source: BusyCircuits


Pulled from the BusyCircuits Coupé Eurorack system and double up into a dual state variable filter the MCFx2 that offers serial, parallel and linked functionality.



The Coupé Eurorack system is a fabulous modular system based around the SQUID SALMPLE, QUAID MEGASLOPE and MCO oscillator. The filter in the system is the MCF state variable filter with analog 3-pole cores each with high, low and bandpass modes. BusyCircuits has taken the MCF, doubled it and added some extra spice to turn it into the super-interesting standalone MCFx2 dual filter.

The MCFx2 can function in a number of configurations. You can use the filters in series by routing the audio from one to another. Via a Link switch you can chain the cutoffs together so you can control both with one knob. You can do the same to use them in parallel with different audio signals going through each. Both cutoff knobs and resonance knobs can be voltage controlled.

The result can be fierce dual peak filtering or smooth multi-modes, stereo processing or mono overload. When pushed to self-oscillation you also have a 1v/oct trackable dual sine wave oscillator.

Here’s an in-depth look at the module.


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This could be a really busy filter in your system with the ability to run in different ways. The front panel is wonderfully clear to the point of being a bit boring but that’s no reflection on the sound with is juicy and complex. The MCFx2 is available now for £228.

BusyCircuits MCFx2

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