User Guide

114
Module: Mod
Module: Mod
If you cannot quite recall the meaning of some of
these terms, up next is ...
... a primer on LFO basics
The output signal of an LFO (low frequency
oscillator) is not audible as such. Instead, this
slowly oscillating signal - whose frequency and
waveform you can define - is used to shape an
audible audio signal. This process is called
modulation. The signal can be influenced in various
ways depending on the defined modulation
destination:
In an amplitude modulation, the mod signal shapes
the amplitude, which is the volume of the audio
signal. The volume envelope of the played note(s) is
determined by the mod oscillation. A slow mod
oscillation generates a tremolo effect. Can you see
the similarity to the shaper and the ADSR envelope?
You are right, they are similar but unlike the one-off
effect of a Normal mode ADSR envelope modulating
a sound (see page 101) the mod module’s effect is
periodic, continuing for as long as the note is played.
In Neuron, you can generate amplitude modulation
by routing mod to the resynators’ volume.
In addition to amplitude, you can also modulate the
frequency of the audio signal. Frequency
modulation changes pitch rather than varying
volume. When this is done slowly by way of a low-
frequency modulating oscillation, the result is the
ever-popular vibrato effect. Again, there is some
similarity to the shaper: In Normal mode, the shaper
imitates the initial transient response reminiscent of
the gradually swelling tone of a wind instrument.
However, ultimately it does not generate vibrato
because this requires a periodic modulation.
In order to create frequency modulation in Neuron,
route mod to the resynators’ pitch.
You will find a polyphonic, freely
routable low frequency oscillator
(LFO) in the mod module located
to the left of resynator 1.
It generates a periodic, low-
frequency oscillation that you
can use as the modulation source
for the following destinations:
Volume, pitch and model
parameters of both resynators,
the amount of the blender module
and the cutoff frequency of the
filter currently selected in the silver module.
Neuron.book Seite 114 Montag, 23. Dezember 2002 2:28 14