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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

Page 1 of 10

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

Summary of content (10 pages)

PAGE 1
Corgasmatron Manual v1.0 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.
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Corgasmatron Manual v1.0 Front Panel 1- FREQ - Cutoff frequency of the filter. This sets the center frequency of the filter. 2- Xfader section. XFADE position knob, CV polarity switch and Xfade direction switch. The Xfade knob acts as cross fader in Parallel configuration and using MIX out if nothing is plugged into the Xfade jack. Once patched the Xfade knob becomes a CV attenuator. 3- Q is also referred to as resonance.
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Corgasmatron Manual v1.0 Input and Output jacks (left to right top to bottom) FM1 A CV input to VCF A filter cutoff, attenuated by FM1 A knob FM2 A CV input to VCF A filter cutoff, attenuated with inversion by FM2 A knob. Normalled to VCF B FM2. FM2 B CV input to VCF B filter cutoff, attenuated with inversion by FM2 B knob. This is a switching jack, inserting a plug here will break the normal from FM2 A. Using this normal allows the same CV source patched into FM2 A to control both filters.
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Corgasmatron Manual v1.0 Rear Panel 1 - XFade Adj. This trimmer adjusts the blend between channel A and channel B of the xfader. To adjust make filter A resonate at 1 Khz, set routing configuration to parallel and monitor out the MIX out. Turn the Xfade front panel knob fully CW so as to only pass filter B. Now adjust the trimmer slowly until the filter A is no longer heard. This is calibrated at the factory. 2 - jumper, Q behavior selection filter B. This jumper selects different diodes for the Q circuit.
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Corgasmatron Manual v1.0 3 - Power connector. Ten pin power connector which conforms to the Eurorack standard. -12V on the board must be connected to -12V on your bus board. -12V is commonly referred to as the red stripe. It is very important that the power connector is not connected in reverse! Although no damage will be done to the Corgasmatron other modules may be damaged by reversing this connector. 4 - Expansion header for filter B.
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Corgasmatron Manual v1.0 1V/Oct calibration procedure: The Corgasmatron is capable of being tuned to track 1V/Oct over a range of about three to four octaves. You can tune the tracking using the dedicated 1V/Oct trimmers on the back of the pcb. The calibration can be done by ear or using a frequency meter. All you need is a voltage source capable of playing octave intervals (e.g. midi keyboard + cv converter). Filter A: 1.
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Corgasmatron Manual v1.
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Corgasmatron Manual v1.0 Patch Examples Example 1 - Classic Style Variable Band Pass Filter This patch shows the most common dual filter mono synthesizer patch. High pass VCF goes into low pass VCF providing a variable width band pass filter. Use normals on the 1v/oct A and FM2 A CV inputs to control both filters at once, Instructions Set the Corgasmatron to Serial mode. Audio input goes into IN A. Audio output comes from MIX. Patch according to the chart above to create the classic VCO-VCF-VCA voice.
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Corgasmatron Manual v1.0 Video Manual http://vimeo.com/26173568 Follow the above link for a walk through of the Corgasmatron functions. Support Web:" http://intellijel.com/ email:"support@intellijel.
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Corgasmatron Manual v1.