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SERGE
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9
between -12V and +12V . This is useful for generating complex control voltages and for patching a random voltage
generator . In fact, the Random Voltage Generator module is a Smooth & Stepped Generator internally patched
to function exclusively as such . Note that a Noise Source is needed for use of the GTO as a random voltage
generator . The red COUPLER OUT (
11
) is 0 to 5V, the black (“hot”,
12
) one goes rail to rail (roughly -12V to +12V
i .e . 24V pp) .
Please be careful when using the black Coupler
, e .g . when routing to a ADC converter or similar .
GTO - First Steps
The SSG is a complex, highly versatile module which allows for a wide range of uses and abuses both in the
audio and CV range, so it may require some time and experimenting to familiarize oneself with it - don’t expect
the module to reveal its secrets and power in a few minutes after you first power it up . Here are some very basic
ideas to start with:
1 .
Patch the Smooth side of the SSG to cycle by connecting the
Cycle
jack into the
Input
. The euro-rack
version provides a Cycle switch to achieve the same . The Smooth side then produces a triangle wave
from about 0V to 5 V (aplitude slightly depends on frequency), the LED should indicate that . The
Rate
pot
determines the frequency of the cycle / output - the range is very wide, going from below 1 Hz to appr . 4
kHz . The
Cycle jack
provides a corresponding Pulse wave output .
2 .
Set the Stepped side to cycle as well by patching Cycle to IN (or turning on the
Cycle switch
in the
eurorack module) . Unlike the Smooth side,
the Stepped side will not generate an output in Cycle mode
(=LED stays dark or seems frozen) unless a Puls wave is fed into the
Sample
jack .
Patch a pulse wave
- e .g . the
Cycle
output of the Smooth side - into the
Sample
jack to bring the stepped side to life . The
stepped side is essentially a sample-and-hold circuit, the
Rate
knob determines how long each step is at
the Stepped output . Changing the frequency of the pulse going into the
Sample
input and/or changing
the
Rate
affects the output .
3 .
The Smooth Side can be used as a
Lowpass filter
. Feed an audio signal (e .g . a saw or pulse wave from
an oscillator) into the
In jack
(Cycle switch turned off) and listen to the signal coming from the
Smooth
out
while you turn the
Rate knob
. At maxium position (full CW) the signal should sound pretty much un-
filtered, turning the Rate down (counterclockwise) the harmonics get filtered / smoothed out, at minimum
position the signal will disappear altogether .
Using the VC input jack in the same setup as before, this filter effect can be used to achieve the effect of a
Lowpass Gate / VCA
. Send an CV envelope (e .g . from a DUSG or an Extended ADSR module) into the VC
jack and turn the VC knob sufficiently high . Tune the Rate pot to a position so that the output is silent when no
CV is applied but clearly audible when the envelope is high . This causes a VCA effect, but the envelope not only
determines the amplitude, but also the amount of filtering applied (like a lowpass gate) .
4 .
Try whatever you can think of and try not to distinguish between CV and audio - while originally the SSG
was primarily for control voltages, very interesting results can be found by going into audio range .
