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Korg R3 Owner's Manual: Osc1 (oscillator 1)

Synthesizer / vocoder.
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5. OSC1
The oscillator generates a waveform that is the basis of the sound. Each timbre has two oscillators. The parameters in this section apply to
oscillator 1. Knob [1] is used to select the basic waveform, and knob [2] to select a type of oscillator modulation. The functions of knobs [3] and
[4] will be determined by the settings of knob [1] and knob [2] (☞p.28 -29).
Knob [1]
WAVE (Waveform Select)
[Saw, Pulse, Triangle, Sine, Formant,
Noise, DWGS, Audio In]
Selects the waveform for oscillator 1. The
Saw, Pulse (square), Triangle and Sine are
traditional waves associated with analog
synthesizers.
Saw: A sawtooth wave.
Pulse: A pulse wave.
Triangle: A triangle wave.
Sine: A sine wave.
Formant: A formant wave with tonal character-
istics similar to that of a human voice.
Noise: Generates noise.
DWGS: DWGS (Digital Waveform Genera-
tion System) waveforms. These digital
waves are created using harmonic additive
synthesis. Sixty-four DWGS waves are
available
Audio In: An external audio source will
be used in place of the oscillator.
The parameters of the PITCH section
will have no effect on the external au-
dio source connected to the [AUDIO
INPUT 1] or [AUDIO INPUT 2] jacks.
(Oscillator 1)
Knob [2]
OSC1 Mod (Oscillator 1 Modulation Type)
[Waveform, Cross, Unison, VPM]
Selects the type of modulation being applied
to oscillator 1.
The maximum number of playable
voices may change depending on the
combination of "Wave" and "OSC1
Mod" settings.
Waveform (Waveform Modulation): Use
"Control1" to modify the shape of the
waveform.
The following parameters (Cross, Uni-
son, VPM) are only available when the
"Wave" parameter is set to is Saw,
Pulse, Tri, or Sin, and are not available
if the "WAVE" parameter is set to
Formant, Noise, DWGS, or AudioIn.
Cross (Cross Modulation): Cross Modula-
tion uses the output waveform of oscillator 2
(the modulator) to modulate the frequency
of oscillator 1 (the carrier) at high speed to
produce a modulated sound. The waveform
selected by "Wave" will be the carrier
(☞Figure 5-1).
(j)
Knob [3]
OSC1Ctr1 (Control1)
[000...127/–63...+63/---]
The function controlled by this knob is de-
termined by the "Wave" and "OSC Mod"
settings. (☞p.28)
With some settings, this will produce
noise.
Knob [2]
(l)
Unison: Unison simulates skewing the pitch of
five stacked oscillators from within a single
oscillator, to create a richer sound. Unlike the
unison SW parameter from the 2. Unison page,
this function does not require additional po-
lyphony.
VPM (Variable Phase Modulation) :
VPM produces metallic-sounding overtones,
using a sine wave at a harmonic (integer) mul-
tiple of oscillator 1's fundamental to modulate
the phase of oscillator 1.In contrast to Cross
Modulation which produces sounds that have
a modulating character, VPM waveforms re-
main static as the new overtones are added.
Oscillator 1 relies on its own sine wave gen-
erator, so unlike Cross Modulation, oscil-
lator 2 has no effect on VPM.
Knob [4]
OSC1Ctr2 (Control2) [000...127/–63...+63/
001...064/001...032/---]
The function controlled by this knob is de-
termined by the "Wave" and "OSC Mod"
settings. (☞p.28)
Figure 5-1: Cross Mod
Cross Mod Depth
OSC1
OSC1
OSC1
output
Freq Mod
OSC2
OSC2
output
Figure 5-2: Unison Mod
Unison Detune
OSC1–1
OSC1–2
OSC1–3
OSC1 Output
OSC1–4
OSC1–5
27

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