Vpm 4 Op Select - Korg Soundlink DRS OASYS PCI Patches & Effects Manual

VPM

VPM 4 OP Select

This Patch is a four-operator VPM synthesizer with eight selectable algorithms, as
shown in "VPM 4 OP Select algorithms," on page 212.
VPM stands for Virtual Phase Modulation, in which the phase of one oscillator (the
Carrier) is modulated by another oscillator (the Modulator), producing a complex
timbre. The combination of an oscillator and its amplitude envelope is known as an
"operator." VPM is particularly well-suited to bells and electric pianos, although it
can produce many other sounds as well.
OP 1, OP 2, OP 3, OP 4
The function of each operator will change depending on which algorithm is
selected. In some algorithms, the operator may be a modulator; in others, it may be
a carrier.
Carrier operators determine the basic pitch and amplitude envelope, while
modulator operators change the timbre of the carriers.
Oscillator
Ratio
1.0-31.0. This selects the basic tuning for the oscillator.
Fine
0.0-100.0. This allows you to fine-tune the ratio. You can think of this as the digits to
the right of the decimal. For instance, setting the Ratio to 3.0 and Fine to 53.0 results
in an actual ratio of 3.53. Setting Fine to 100 is the same as increasing the Ratio by 1.
Detune
+/-10.00. This allows you to detune the oscillator, in cents (1/100 of a semitone).
Waveform
Sine, Sine + 1st Harmonic, Sine + 1st & 2nd Harm. This sets the waveform for the
oscillator.
Feedback (OP 4 Only)
+/-100. Feedback allows the operator to self-modulate, which changes the shape of
the waveform. At high levels of feedback, the waveform will approach a sawtooth
shape.
Envelope
This envelope controls the output level of the operator.
Attack
0-100. This sets the attack time of the amplitude envelope, which controls how long
it takes from the moment that the key is pressed until the envelope reaches its peak.
OASYS PCI
VPM 4 OP Select
209