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Chapter 3: Virus Indigo Controls 27

Car Spread Controls the spread of the band-pass

filters for the carrier signal. This affects the intel-

ligibility of speech.

Spect Bal Controls the spectral balance between

the higher and lower frequencies of the vocoder

signal. This influences the overall character of

the vocoder and can be used to increase the in-

telligibility of speech.

Bands Controls the number of active filter

bands. The number of filter bands determines

the complexity and quality of the Vocoder. In-

creasing the number of bands generally in-

creases the intelligibility of speech.

Attack Controls the attack time of the vocoder’s

envelope follower. Longer attack times soften

the response of the vocoder and decrease the in-

telligibility of speech.

Release Controls the release time of the vo-

coder’s envelope follower. Longer release times

soften the response of the vocoder and decrease

the intelligibility of speech.

Source Bal Controls the mix between the carrier

signal and the input source. A setting of –64 is

100% carrier signal (the oscillators or noise gen-

erator). A setting of +63 is 100% modulator sig-

nal (the speech input). A setting of 0 is generally

best.

Input

Use the Input controls to pass an external audio

signal through Virus Indigo for processing. You

can shape the audio signal in many unique ways

by applying filtering, filter saturation, chorus,

and delay effects, and modulation.

Mode Enables and disables external audio input.

Passing an audio signal through Virus Indigo fil-

ters, amplifiers, and effects can produce interest-

ing results.

 In Dynamic input mode, the envelope gener-

ator is active and you must play MIDI notes to

pass audio through.

 In Static input mode, the envelope generator

is not active and you don’t need to play MIDI

notes to pass audio through.

Input Meters Show input signal levels when ex-

ternal input mode or the Vocoder is used. If clip-

ping occurs, reduce the level of the external au-

dio.

Envelope Follower

Use the Envelope Follower to replace the filter

envelope with an envelope based on the dynam-

ics of an external input signal.

With high filter Envelope Amount settings, the

Envelope Follower will produce automatic

“wah-wah” effects. Other parameters can also be

modulated with the Envelope Follower by using

the ModMatrix page and choosing Filter Enve-

lope as a modulation source.

Using a high number of bands reduces voice

polyphony. A Band setting of 32 can use up

to six voices of Virus Indigo polyphony.

See “Using the Vocoder” on page 49 for

more information on using the Vocoder.

Static input mode uses two Virus Indigo

voices.

See“Using Virus Indigo as a Filter” on

page 51 for more information on using ex-

ternal audio inputs.

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