9 - Synthesizer Basics
Modulation Processors
152
Proteus X Operation Manual
Modulation Processor Examples
This example routes the Pink Noise generator through one of the Lag Processors in
order to derive a smooth random function. A smooth random wave is useful in small
amounts to add a degree of natural variation to timbre when routed to filter cutoff.
Normal pink noise is low pass filtered audio frequency noise with a 3 dB/octave slope to
give equal energy per octave. Our pink noise is actually more like very low frequency
filtered (mauve?) noise, but it is perfect for use as a random control source.
The Quantizer can generate interesting whole-tone scales when envelope generators or
LFOs are routed to the input. The quantizer turns a smoothly changing input signal into
a series of steps. By routing the output of the quantizer to Pitch and adjusting the cord
amounts, you can control both the number of steps and the pitch interval of each step.
The input cord amount controls how many steps are generated. A sawtooth wave
(LFO+) feeding the input, and the cord amount set to 100% generates sixteen steps. The
output cord amount controls the size (or interval) of the steps.
f
Experiment with this
patch by connecting
other sources and
destinations to the
quantizer.
This patch generates an ascending arpeggio every time you press a key. The block
diagram of the patch is shown below. The patch is very straightforward except for the
DC offset which was added in to bring the pitch down into tune. (Sometimes you have
to fix a problem, but thanks to the mod processors there's usually a way around it to
achieve the desired result.)
You can probably start to see some of the possibilities (and there are many). Whenever
you find yourself wishing for some esoteric type of control, take a minute and think if
there is a way to achieve the desired result using the modulation processors.
Lag
Processor
Pink
Noise
Filter
Cutoff
Cord
Cord
Lag Smooths
Pink Noise
Smooth
Random Function
Quantizer
Number
of
Steps
Size
of
Steps
Cord
Cord
Quantizer
Pitch
Number
100%
LFO+
DC
Size
100%
Cord
Cord
Cord
-50%
Содержание ProteusX
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