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4. Basic functions
M M M M
O O O O D D D D U U U U L L L L A A A A T T T T I I I I O O O O N N N N
The method of controlling one function in a module with another function is called to "modulate".
When you play on a keyboard and the oscillator changes its pitch, you are modulating the pitch with the
keyboard signal. Another example is an envelope opening up a filter when a key is pressed. Logic signals
from the keys tell the envelope to start modulating the cut-off frequency of the filter. Modulation can be
positive or negative, e.g. the cut-off frequency of a filter can increase with positive modulation and de-
crease with negative modulation.
As you will see, there are some modules in Nord Modular that can change the polarity of a modulator
signal. Some modules can be set to send either bipolar or unipolar control signals, like the Constant mod-
ule or the Control Sequencer module.
M M M M
O O O O D D D D U U U U L L L L A A A A T T T T I I I I O O O O N N N N I I I I N N N N P P P P U U U U T T T T S S S S
A module parameter that can be modulated from an external source has a modulation input, often in
combination with modulation amount control. This is called a mod-input. The modulation amount con-
trol attenuates the incoming signal. The mod-inputs can be red, as in the OscillatorA module, which
means it is capable of handling signals at full audio bandwidth, or they can be blue, as in the FilterF mod-
ule, working at 1/4 audio bandwidth.
M M M M
- - - -
O O O O D D D D
A A A A M M M M O O O O U U U U N N N N T T T T K K K K N N N N O O O O B B B B S S S S
There are three different response behaviors of the mod-amount knobs next to the modulation inputs:
linear [Type I], exponential [Type II] and amplified linear [Type III]. The different response type(s) will
be indicated for each module in the module reference section starting on
[T [T [T [T
I] I] I] I]
Y Y Y Y P P P P E E E E
The mod-amount knobs attenuates the incoming signal in a linear fashion. A setting of 127 (maximum)
leaves the incoming signal unaffected, a setting of 64 attenuates the incoming signal by a factor 0.5 (leav-
ing half of the level of the incoming signal to modulate). A setting of 0 shuts off the modulation com-
pletely. The pulse width in the aforementioned scenarios is an example of Type I attenuation.
[T [T [T [T
II]
II]
II]
II]
Y Y Y Y P P P P E E E E
The mod-amount knob attenuates the incoming signal in an exponential fashion. A setting of 127 (max-
imum) leaves the incoming signal unaffected, a setting of 64 attenuates the incoming signal by a factor
considerably less than 0.5 (leaving less than half of the level of the incoming signal to modulate). A setting
of 0 shuts off the modulation completely. The pitch mod-input on the various oscillators are examples of
Type II attenuation.
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A A A A T T T T T T T T E E E E N N N N U U U U A A A A T T T T O O O O R R R R S S S S
NORD MODULAR V3.0
page
93.
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