
Access Music Virus Indigo Plug-in Guide14
FM Mode Selects the modulator for oscillator 2.
Choices are:
• PosTri: frequency modulates oscillator 2 with
a positive triangle waveform generated by os-
cillator 1.
• Tri: frequency modulates oscillator 2 with a
triangle waveform generated by oscillator 1.
• Wave: frequency modulates oscillator 2 with
the waveform currently selected on
oscillator 1.
• Noise: frequency modulates oscillator 2 with
the noise generator.
• Input: frequency modulates oscillator 2 with
the audio of the track on which the Indigo
plug-in is currently inserted. If the audio is a
stereo signal, only the left channel is used. If
there is no audio signal on the track, no mod-
ulation is applied.
Env FM Controls how much the filter envelope
affects frequency modulation. Use this to create
FM-based timbre-change effects that vary over
time.
Env Osc 2 Controls how much oscillator 2 is
pitch-modulated by the filter envelope. Use this
to create pitch-change effects that vary over
time.
Phase Init Changes the initial phase relation-
ship between oscillator 1 and oscillator 2 at the
start of a note. Set to 0, both oscillators oscillate
freely, as in a conventional analog synthesizer.
Set to 1 and higher, oscillator 1 maintains a
phase angle of 0, while the phase of oscillator 2
shifts increasingly at higher values. Use this to
enhance drum and percussion sounds.
Osc 3
Use the controls in the Osc 3 section to select
the waveshape and other parameters of
oscillator 3.
Mode Selects among 64 preset waveshapes, in-
cluding sine, triangle, and many more complex
waveshapes.
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.
Detune Detunes the pitch of oscillator 3 relative
to oscillator 1 and 2. Detuning helps animate
and thicken sounds.
Sub/Noise
Use the sub oscillator to increase the weight of a
sound by adding a tone an octave below the
pitch of oscillator 1.
Use the noise generator to add unpitched white
or pink noise to a sound.
Sub Shape Selects the waveshape of the sub-os-
cillator, triangle or square.
Noise Color Varies the color of the noise pro-
duced by the noise generator from a high-fre-
quency “white noise” effect at higher values to a
darker low-frequency “pink noise” effect at
lower values.
See Appendix C, “Virus Indigo Oscillator
Waveforms”for a list of the 64 preset oscil-
lator waveshapes.
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