Synapse DUNE 2, Руководство пользователя

Страница: 27 / 78

FM mode
Frequency modulation (FM) is a form of synthesis
which can create a wide variety of sounds, but is es-
pecially known for bell type sounds. The FM mode
uses three sine waves as a basis for sound generation,
each sine wave is commonly referred to as an operator.
Two operators "A" and "B" modify the frequency of
operator "C". Two algorithms are available to choose
from:
B C
A
B
A
C
Feedback
Feedback
Figure 4.4: FM Algorithms.
In the first algorithm, operator A modulates the fre-
quency of operator B, and the output of this operation
modulates the frequency of operator C.
In the second algorithm, both operator A and B
modulate the frequency of operator C.
Both algorithms have a feedback path, marked with
a dashed line. Applying feedback creates more inter-
esting timbres. The amount of feedback is controlled
with the FBK knob.
In order to create interesting FM sounds, it is impor-
tant to change the operator levels "A" and "B" over
time. This can be accomplished by routing one or more
MSEG curves on the destination labelled FM Amt A
and FM Amt B. A slow, decaying envelope routed on
the operator levels A or B will create sounds that start
with a bright timbre, then become increasingly darker.
A fast decaying envelope can create punchy sounds.
4.3 Oscillator 3
The third oscillator generates a simple periodic wave-
form, which can be chosen by clicking on the waveform
display.
Semi
The control labelled SEMI adjust the coarse tuning
of the third oscillator, in semitones. The range spans
+/- 36 semitones. A larger range can be obtained by
using the modulation matrix, if required. This will be
covered in chapter 5.
27 DUNE 2 User’s Manual