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Chapter 3: Virus Indigo Controls 17

The two Virus Indigo filters can be used:

 In series, where sound is processed first by fil-

ter 1, then by filter 2.

 In parallel, where sound is processed by each

filter independently.

 Split, where the filters operate in parallel and

receive independent input signals whose stereo

spread can adjusted with the Pan Spread control

(in the Unison section of the Misc page).

Global

Use the controls in the Global section to control

the signal routing through the filters (series or

parallel) and the amount of saturation (the

amount of overtones) applied between the fil-

ters.

Saturation Saturation selects the amount of

overtones added to the filtered signal through

the use of distortion. Choices are: Off, Light

Soft, Mid, Hard, Digital, and Shaper.

Because saturation is added between the two fil-

ter stages, a saturated sound can be filtered by

filter 2.

Saturation character is strongly influenced by

oscillator volume, waveshape, and filter reso-

nance.

Osc Vol Controls the output level of oscillators 1

and 2 fed into the filter. Values above zero let

you add up to 12 dB of additional gain to the

saturation, without increasing the overall patch

volume.

Filter Routing Selects one of four different filter

routing options for operating the filters in series

or parallel:

 SER4: The filters operate in series with two

poles each, for a total of four poles and a 24 dB

per octave slope.

 SER6: The filters operate in series. Filter 1 has

four poles and filter 2 has two poles, for a total of

six poles and a 36 dB per octave slope.

 PAR4: The filters operate in parallel with two

poles each.

 SPLIT: The filters operate in parallel with two

poles each. They receive independent input sig-

nals whose stereo spread can be specified with

the Pan Spread control.

Filter Balance Controls the balance between the

output levels of filter 1 and 2.

Filter/Env page

Virus Indigo filter routing choices

SER4

osc 1

osc 2

sub-osc

filter 1 (12dB)

noise

saturation filter 2 (24dB)

SER6

osc 1

osc 2

sub-osc

filter 1 (24dB)

noise

saturation filter 2 (12dB)

PARALLEL

osc 1

osc 2

sub-osc

filter 1 (12dB)

noise

filter 2 (12dB)

saturation

SPLIT

osc 1

sub osc

osc 2

noise

filter 1 (12dB)

filter 2 (12dB)

saturation

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 82 83

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