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Access Music Virus Indigo Plug-in Guide26

The FX-2/Global Page

This page has controls for the vocoder, arpeggia-

tor, external audio input, envelope follower,

and for global tuning, key mode, pitch bend,

and other parameters.

Vocoder

The Vocoder merges the frequencies of two dif-

ferent audio signals together to give one signal

(the carrier) the texture of the other signal (the

modulator).

The most common use for the Vocoder is to

make sounds “talk” by using an oscillator wave-

form as the carrier and a voice as the modulator.

Both signals are processed through a series of

band-pass filters. The amplitude characteristics

of the modulator signal (the voice) filter bands

are then applied to the carrier signal (the oscilla-

tor). The voice characteristics articulate the os-

cillator’s harmonic content and overall sound.

You can then play the vocoded sound as you

would any Virus Indigo patch.

You are not limited to using an oscillator as a

carrier or a voice as a modulator. Any external

input can be used as a carrier, and any signal

bussed to Virus Indigo can be used as a modula-

tor.

Harmonically rich sounds typically make the

best carriers.

Mode Selects the source of the Vocoder’s carrier

signal. Choices are:

• Off, Vocoder is off.

• Osc, any tone generator in the Oscillator

page’s Mixer section

• Osc Hold, oscillator 1 and 2 waveforms,

with the last note held until the next note

is played

• Noise, the noise generator only

• Input, external audio input using the Key

Input

Center Freq Sets the center frequency of the

band–pass filters for both the modulator and

carrier signals.

Mod Offset Controls the amount of offset be-

tween the carrier and modulator filter bands.

Mod Q Controls the resonance of the band-pass

filters for the modulator signal.

Mod Spread Controls the spread of the band-

pass filters for the modulator signal. This affects

the intelligibility of speech.

Car Q Controls the resonance of the band-pass

filters for the carrier signal.

Link When selected, the Link button sets Mod Q

and Carrier Q, and Mod Spread and Carrier

Spread to an identical amount.

FX-2/Global page

Using the Vocoder reduces voice polyphony.

Additionally, the Virus Indigo filters are not

available since they are used for vocoding. If

you want to filter a vocoded sound, insert a

second Virus Indigo plug-in on the same

track and use its filters.

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