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Chapter 5: Virus Indigo Tutorials 43

6 Change the filter mode and repeat the previ-

ous step.

7 Try also varying the settings of the Filter Enve-

lope.

Using just these few controls you can create a

variety of dramatic effects.

Using Key Follow

Key Follow controls how filter cutoff frequency

is affected by MIDI note number.

In general, the high-frequency content of natu-

ral instruments increases as their note pitch in-

creases. Use Key Follow to mimic this behavior

or to suppress it.

Memory Location 3 demonstrates the effect of

Key Follow.

To hear the effect of key follow:

1 Reset the patch to its original state by choos-

ing Tutorial Sounds > Tutorial 3 Sound from the

Librarian menu.

2 Click memory location 3, “Filter Key Follow”

and press the Spacebar to begin playback.

3 During playback, watch the filter 1 KeyFollow

controls and listen to how the sound character

changes.

Notice that with positive Key Follow settings

higher notes are clearer than lower ones. This is

because the filter opens wider with higher MIDI

notes.

Conversely, with negative Key Follow settings,

higher notes are more muffled. This is because

the higher the MIDI note, the more the filter

closes.

Changing Filter Routing

Audio can be routed to the two Virus Indigo fil-

ters so that they operate in series (one after an-

other) or in parallel (independent of each

other).

The routing that you select influences the char-

acter of the filters and the sound that is pro-

cessed—especially when Saturation is used.

The filter routing options are:

Ser4 The filters operate in series with two poles

each, for a total of four poles and a 24 dB per oc-

tave 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 for a total of four poles.

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.

Memory Location 5 demonstrates the effect of

filter routing.

To hear the effect of filter routing:

1 Reset the patch to its original state by choos-

ing Tutorial Sounds > Tutorial 3 Sound from the

Librarian menu.

2 Click memory location 4, “Filter Routing” and

press the Spacebar to begin playback.

3 During playback, watch the Filter Routing

controls and listen to how the sound character

changes.

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