Skull And Circuits VCF-4 Switched Capacitor Filter & Metal-o-tron Metallic Percussion Modules

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As if there are not enough filters in the Eurorack world. Yet, here it is, something new. A dual switched capacitor filter, equipped for CV on all the things. A dual filter core no less for stereo use or for all kind of serial filter configuration shenanigans.

VCF-4 is a unique filter in Eurorack land. It’s a switched capacitor design with a lot of bells and whistles, offering a unique sound and flexible sound-scaling capabilities.

2 x 12db switched capacitor filter core
Sweepable LP/BP/HP Mode
+BP/-BP adjustment
Self-oscillating filter
Filter linking ( 1:1, octave down, 2 octaves down )
Serial or Parallel setup possible
Resonance CV control per filter
Filter mode CV control per filter
2x Cutoff frequency CV control per filter
Big fat knobs ( 20HP )

It’s one of the modules I use a lot, so I thought it was about time to get rid of the prototypes I have in my rack and build one that looks more like the real deal. I’ve taken all good things from the first 2 versions, ditched all the bad stuff and add some new stuff. That’s a lot of stuff.

In short, It’s a percussion sound generator, with a focus on metallic sounding percussion. Cymbals, hihats, tin cans, gongs, cowbells, … you name it, it’ll do it. It doesn’t really stop there, it’s able to create quite some unique sounding percussion elements, as well as some interesting drone textures. So it’s quite a versatile thing to have in your rack.

So, how does it work. The basic sound properties are generated by 4 square oscillators going through a logic XOR gate, combined with a noise generator and external inputs. The whole lot goes through a filter to shape the frequency properties and then through a voltage controlled amplifier – still following? I’ve drawn up a little schema to clarify the whole lot a bit.

See Skull And Circuits for additional details.