Korg Synthesizer/Vocoder microKORG Owner's Manual page 25

Synthesizer/vocoder
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3. OSC1
WAVE
CONTROL 1
Triangle Wave (
):
CONTROL 1
You can modify the waveform by
This is a triangle wave, which has
adjusting this value.
weaker overtones and a stronger
A setting of 0 will produce a triangle
fundamental than a sawtooth wave
wave, and a setting of 127 will pro-
or square wave. It is suitable for
duce a waveform with a pitch that
mellow bass sounds.
is one octave and a fifth higher.
( Figure 3-3)
Sine Wave (
):
CONTROL 1
On a synth program, this adjusts the
This is a sine wave. This waveform
depth of cross modulation.
contains only the fundamental, and
On a vocoder program, this modi-
no overtones at all. It can be used
fies the waveform.
to create claves or bass drum
sounds. In some synth programs,
oscillator 2 is used to perform cross
3-2
modulation*
( Figure 3-4), creat-
ing a more complex overtone struc-
ture.
Cross modulation by a sine wave
cannot be applied to a vocoder pro-
gram.
Since a sine wave contains no
overtones, the filter will not
modify its tone.
CONTROL 1
Vox Wave (
):
This simulates a waveform similar
Adjusting this value will modify the
to human vocal cords. Even if the
waveform. ( Figure 3-5)
oscillator pitch is changed, the fre-
quency spectrum will be main-
tained, which makes this effective
when used for vocal-type sounds or
as a vocoder oscillator.
Select HPF or BPF as the filter, and
adjust "Cutoff" to create a vocal-
type sound.
(Oscillator 1)
— SYNTH/VOCODER
CONTROL 2
[0...127]:
CONTROL 2
[0...127]:
LFO1 is used to apply wave form
modulation to the waveform speci-
fied by "CONTROL 1." The "CON-
TROL 2" setting specifies the depth
of the modulation produced by
LFO1.
[0...127]:
CONTROL 2
[0...127]:
On a synth program, this adjusts the
depth of additional modulation
applied by LFO1 to the cross modu-
lation specified by "CONTROL 1."
On a vocoder program, this adjusts
the depth of modulation applied by
LFO1 to the waveform that you se-
lected by "CONTROL 1."
[0...127]:
CONTROL 2
[0...127]:
LFO1 is used to apply modulation
to the waveform specified by
"CONTROL 1." CONTROL 2 sets
the depth of the modulation ap-
plied by LFO1.
Figure 3-3
0
63
127
Figure 3-4
*3-2: Cross Modulation
This is a type of oscillator modula-
X-mod Depth + X-mod Depth Mod
tion available on analog synthesizers
OSC2
of the past. Normally, a low-fre-
OSC1
quency signal (such as from an LFO)
OSC1 Output
is used as the modulation source for
an oscillator, but Cross Modulation
lets you use another oscillator as the
modulation source, creating sounds
with a complex overtone structure
that would not normally be produced
otherwise. On the microKORG, you
can use oscillator 2 to apply cross
modulation if a sine wave is selected
for oscillator 1. Gradually raise the
"CONTROL 1" level, and notice how
the sound changes. This can produce
distorted sounds, or sounds with a
Figure 3-5
metallic character.
You can produce an even wider vari-
ety of effects by adjusting the OSC2
0
63
127
"SEMITONE" or "TUNE" parameters.
You can also achieve interesting re-
sults by applying sync modulation
and cross modulation at the same
time.
19

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