Duatt 1U Manual
Usage Examples
These simple parameters provide a wealth of useful functions to the modular synthesist. Here
are some basic examples of how you might employ Duatt 1U in your patches:
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Attenuation : Assume you want to subtly modulate filter resonance, but your filter of
choice doesn’t have a built-in attenuator on its resonance CV input. If you were to plug
the output of your LFO directly into the resonance CV input on your filter, you’d be
modulating it at full amplitude — meaning your LFO would cycle the resonance from
“none” to “ear shattering squelch” and back again. But what if you just want resonance to
undulate a little bit? Duatt 1U to the rescue!
Plug the output of your LFO into Duatt’s IN A , then plug OUT A into your filter’s
resonance CV jack. You’ll now be able to “dial down” the peak-to-peak amplitude of the
LFO using Duatt’s attenuator knob.
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Inversion : Assume you want to control a module with an envelope. Normally, voltage
increases during the attack section of an ADSR, then decreases during the decay and
release segments. But what if you want the inverse? What if you want some sonic
attribute to get more pronounced as the signal decays, not less? For this you need to
invert the envelope. Once again, Duatt’s on the case!
Plug the output of your envelope into Duatt’s IN A , set Channel A’s polarity switch to -/+ ,
then turn its attenuator knob counterclockwise past 12:00 — an inverted envelope now
appears at Duatt’s OUT A .
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Voltage Offsets : Assume you have a Sample & Hold module sending random notes to
an oscillator, only you want to constrain that unruly 10 octave range of notes to just one
or two octaves in the bass range. One way to do this is to use both Duatt channels.
Plug your S&H output into Duatt’s IN B ; connect OUT B to your oscillator’s pitch input;
then use the Channel B attenuator to limit the range of notes to an octave or two. Next,
use Duatt’s Channel A (into which nothing is connected) to negatively offset the note
range down into the bass frequencies. Do this by setting Channel A’s polarity switch to
-/+ , then turn the corresponding attenuator knob counterclockwise past 12:00. Because
nothing is plugged into Duatt’s OUT A , OUT B contains a sum of Channels A and B,
giving you both the reduced note range and the lower frequencies you desire.
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CV Mixing : What if you want to modulate some parameter with more than one control
voltage at a time? Perhaps you want to send a square wave to modulate a filter’s cutoff
frequency giving it a steady “pulsing” sound while simultaneously sweeping it with a
slow, triangular LFO. Duat’s got you covered. And, once again, you’ll be using two
channels.
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