Korg prologue - Page 28

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VPM
This engine is a VPM (Variable Phase Modulation) oscillator that was developed es-
pecially for this instrument. The engine features a simple structure with one carrier
and one modulator, but allows you to create a wide range of sounds.
Sixteen oscillator types are available for this VPM oscillator.
OCTAVE switch [2’, 4’, 8’, 16’]
The pitch of the VPM oscillator can be set in octaves.
TYPE knob [Sin1...Throat]
This selects the oscillator type to use.
The name of the oscillator type will be indicated on the MULTI ENGINE display.
Sin1: Modulated sine wave carrier basic type.
Sin2: Sine wave carrier and a modulator with self-feedback.
Sin3:Sinewavecarrierwithmodulator3harmonicshigher.
Sin4: Sine wave carrier with modulator 5 harmonics higher.
Saw1 Modulated sawtooth carrier basic type.
Saw2: Sine carrier based pseudo-sawtooth type.
Squ1: Modulated square wave carrier basic type.
Squ2: Sine carrier based pseudo-square wave type.
Fat1: Second subharmonic modulator with self-feedback and driven carrier output.
Fat2:Halfsubharmonicmodulatorwithself-feedbackanddrivencarrieroutput.
Air1: Noise modulated sine wave carrier.
Air2: Sine wave carrier modulated by both noise and a sine wave.
Decay1: Type with decaying modulation amount.
TIP
RelativeosetstotheinternalEGdecaytime(seeblockdiagram)can
be added via the PROGRAMEDITmode“Buon7(MULTIENGINE)”
(p.50).Forthelast4types,seingShapeModIntto-100%willdisable
completely the impact of the EG.
Decay2: Type with strong decaying modulation amount.
Creep, Throat: Experimental type with complex and evolving modulations.
carrier
mod. depth (index)
drive
mod
phasephase
f
eedback
pitch ratio
pitch
eg
output
shape mod int.
mod attack
mod decay
noise
noise depth