Chapter 7: Preset Programming
87
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 parameters are:
Frequency, Bandwidth
, and
Boost/Cut
. The Fre-
quency 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 parameter either boosts or cuts
the frequencies within the selected band by a specified amount. Fre-
quencies 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.
Boost
Cut
Freq.
0 dB
+18 dB
-18 dB
Bandwidth
Frequency
Amplitude
Parametric
Filter
The parametric filter is quite flexible. Any range of frequencies can be
either amplified or attenuated. Often times, several parametric sec-
tions are cascaded (placed one after another) in order to create com-
plex filter response curves.
Summary of Contents for MORPHEUS
Page 10: ...1 Chapter 1 Basic Setup INTRODUCTION BASIC SETUP ...
Page 11: ...Morpheus Operation Manual 2 ...
Page 19: ...Morpheus Operation Manual 10 ...
Page 20: ...Chapter 2 Basic Operation 11 BASIC OPERATION ...
Page 26: ...Chapter 3 Master Menu 17 MASTER MENU ...
Page 27: ...Morpheus Operation Manual 18 ...
Page 30: ...Chapter 3 Master Menu 21 MASTER MENU GLOBAL VELOCITY CURVES ...
Page 36: ...Chapter 4 Midimap Menu 27 MIDIMAP MENU ...
Page 37: ...Morpheus Operation Manual 28 ...
Page 46: ...Chapter 5 Effects Section 37 EFFECTS SECTION ...
Page 47: ...Morpheus Operation Manual 38 ...
Page 66: ...Chapter 6 Hyperpreset Menu 57 HYPERPRESET MENU ...
Page 67: ...Morpheus Operation Manual 58 ...
Page 76: ...Chapter 7 Preset Programming 67 PRESET PROGRAMMING PRESET PROGRAMMING ...
Page 77: ...Morpheus Operation Manual 68 PRESET PROGRAMMING ...
Page 93: ...Chapter 7 Preset Programming 83 PRESET PROGRAMMING ...
Page 109: ...Chapter 8 Preset Menu 99 PRESET MENU ...
Page 110: ...Morpheus Operation Manual 100 ...
Page 138: ...Morpheus Operation Manual 128 ...
Page 139: ...Chapter 9 Copy Menu 129 COPY MENU COPY MENU ...
Page 140: ...Morpheus Operation Manual 130 COPY MENU ...
Page 147: ...Chapter 10 Step by Step 137 STEP BY STEP STEP BY STEP ...
Page 148: ...Morpheus Operation Manual 138 STEP BY STEP ...
Page 171: ...Chapter 11 Reference Section 161 REFERENCE SECTION ...