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Chapter 3: Virus Indigo Controls 13

Shape Modifies the waveshape selected with the

Wave Select control. At a Shape setting of 0, the

oscillator produces purely the waveshape se-

lected with Wave Select.

Increasing the Shape value from 1–63 adds pro-

gressively more sawtooth to the selected wave-

shape until, at a setting of 64, the oscillator pro-

duces a pure sawtooth wave.

Increasing the Shape value from 65–126 adds

progressively more square wave to the sawtooth

wave until, at a setting of 127, the oscillator pro-

duces a pure square wave.

Wave Sel Selects among 64 preset waveshapes,

including sine, triangle, and many more com-

plex waveshapes.

PW When a square wave is produced by the os-

cillator, the PW (pulse width) knob determines

the pulse width, and thus sound character of the

square wave.

The control range is from 0–127. At 0, the pulse

width is 50% (perfectly square). At 127, the

pulse width is 0% (inaudible).

Semitone Transposes the pitch of the oscillator

up or down in semitones (half-steps). The con-

trol range is from –48 to +48 (four octaves up or

down). Use this feature to tune the oscillator to

an interval such as a perfect fifth for interesting

tonal effects.

Key Follow Controls how MIDI notes affect oscil-

lator pitch. At its default setting of +32, playing

a 1-octave scale on a MIDI keyboard controller

produces a normal 1-octave pitch change.

At a setting of +63, playing a 1-octave scale

transposes the pitch upwards by two octaves

(producing a whole tone scale).

At +16, playing a 2-octave scale transposes the

pitch upwards by one octave (producing a quar-

ter tone scale). Negative values transpose pitch

downward. At a setting of 0, MIDI notes do not

affect pitch.

C3 (MIDI note number 60) is the starting point

or base note.

Osc 2

Use the controls in the Osc 2 section to select

the waveshape and other parameters of

oscillator 2.

Shape See the description for Osc 1.

Wave Sel See the description for Osc 1.

PW See the description for Osc 1.

Semitone See the description for Osc 1.

Detune Detunes the pitch of oscillator 2 relative

to oscillator 1 and 3. Detuning helps animate

and thicken sounds.

Key Follow See the description for Osc 1.

Sync Switches phase synchronization of

oscillator 2 to oscillator 1 on or off. Turning

Sync on and varying the pitch of oscillator 2 cre-

ates unique, hard-edged timbral effects.

FM Amount Controls how much oscillator 2 is

frequency-modulated by oscillator 1. Depend-

ing on the interval between the oscillators and

the amount of frequency modulation applied,

you can greatly increase the harmonic complex-

ity of a sound with FM. Use this with the Sync

control to enhance harmonic complexity even

more.

See Appendix C, “Virus Indigo Oscillator

Waveforms”for a list of the 64 preset oscil-

lator waveshapes.

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