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Chapter 7: Preset Programming
PRESET PROGRAMMING
Using a filter, we now have a way to control the harmonic content of a sampled
sound. As it turns out, even a simple low pass filter can simulate the response of
many natural sounds.
For example, when a piano string is struck by its hammer, there are initially a
lot of high frequencies present. If the same note is played softer, there will be
fewer of the high frequencies generated by the string. We can simulate this
effect by routing the velocity of the keyboard to control the amount of high
frequencies that the low pass filter lets through. The result is expressive, natural
control over the sound.
If an envelope generator is used to control the cutoff frequency of a low pass
filter, the frequency content can be varied dynamically over the course of the
note. This can add animation to the sound as well as simulate the response of
many natural instruments.
PARAMETRIC FILTERS
A more complex type of filter is called a parametric filter. A parametric filter
gives you control over three basic
parameters
of the filter. The three param-
eters are:
Frequency, Bandwidth
, and Boost/Cut. The Frequency parameter
allows you to select a range of frequencies to be boosted or cut, the Bandwidth
parameter allows you to select the width of the range, and the Boost/Cut param-
eter either boosts or cuts the frequencies within the selected band by a specified
amount. Frequencies not included in the selected band are left unaltered. This
is different from a band pass filter which attenuates (reduces) frequencies
outside the selected band.
The parametric filter is quite flexible. Any range of frequencies can be either
amplified or attenuated. Often times, several parametric sections are cascaded
(placed one after another) in order to create complex filter response curves.
Boost
Cut
Freq.
0 dB
+18 dB
-18 dB
Bandwidth
Frequency
Amplitude
Parametric
Filter
Содержание Ultraproteus
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