The Corgasmatron is a two independent multi mode filters and a cross fader mounted behind a
16HP Eurorack panel. The Corgasmatron's sound can range from ultra clean and precise, to
extremely ballsy and dirty.The resonance is incredibly musical and interesting and is prime for
all sorts of experimenting and sound design. The normalling, routing and cv options have been
carefully selected to allow for a lot of control over the modules functionality and capabilities.
The original circuit was designed by analog guru david g. dixon after carefully studying and
analyzing the classic korg ms-20 filter. His work resulted in a completely original circuit based
around ssm2164 vca chips. This design is capable of almost identical results but is far more
versatile. This is not a clone, it is an entirely new and modern circuit with many enhancements.
Corgasmatron Manual v1.0
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Key features:
• 16HP and shallow (two pcbs in parallel so it is
skiff friendly)
• two independent filters, each with LP, HP and
Notch modes.
• Unique resonant (Q) drive control
• A Switch links the two filters allowing both
parallel and serial routing via normals to input B
(which can be broken by inserting a cable at
input B).
• Oscillates very easily and can be used as a
dual sine VCO. Using the resonance controls
this Sine shape can be colored.
• 1V/Oct inputs for each filter
• Built in full featured cross fader allows voltage
controlled xfading between the two filters. The
Xfade has a switch to select either unipolar
(e.g. envelopes) or bipolar (e.g. lfo) control of
the xfade position. There is also a switch to
select direction. With nothing plugged into the
Xfade jack the xfade knob controls the fade
position. When an external CV is patched in the
same knob acts as an attenuator for the control
signal.
• Jumpers on the back to select "modern" or
"vintage" resonant modes (two different
feedback paths for the resonance that use
different diodes)
• Expansion jacks for adding additional filter
inputs and VC control of resonance
