Access VIRUS|POWERCORE Especificaciones descargar pdf (Pagina 46)

Access Music Virus Indigo Plug-in Guide42

BS (band-stop) Lets all of the frequencies of a

signal pass, except for a narrow frequency band

or notch around the cutoff.

Memory Location 1 demonstrates each of these

filters and how the Cutoff control affects them.

To hear each filter type:

1 Click memory location 1, “Filter Modes” and

press the Spacebar to begin playback.

2 During playback, watch the filter 1 Cutoff and

Mode controls and listen to how the sound

character changes.

When playback stops, experiment with the

filter 1 Cutoff and Mode controls while playing

your MIDI keyboard controller.

Using Filter Resonance

Filter resonance increases the amplitude of fre-

quencies near the cutoff and suppresses those

that are farther away.

Resonance has a striking effect, especially when

used in conjunction with the low-pass filter: It

adds a nasal quality that increases in proportion

to the amount added.

Resonance affects the band stop filter differently

than it does the other filters. As the resonance

increases, the bandwidth of the notch decreases,

allowing more frequencies to pass.

Memory Location 2 demonstrates how reso-

nance affects each of the filter modes.

To hear the effect of resonance:

1 Reset the patch to its original state by choos-

ing Tutorial Sounds > Tutorial 3 Sound from the

Librarian menu.

2 Click memory location 2, “Filter Resonance”

and press the Spacebar to begin playback.

3 During playback, watch the filter 1 Cutoff,

Resonance and Mode controls and listen to how

the sound character changes.

When playback stops, experiment with the

filter 1 Cutoff, Resonance, and Mode controls

while playing your MIDI keyboard controller.

Using Filter Modulation

Although it is possible and sometimes desirable

to adjust or modulate filter cutoff manually,

there are other ways to do it more efficiently.

One of these is to use the Filter Envelope con-

trols. Though these controls are covered in

greater detail in the section, “Tutorial 4: Ampli-

fier and Filter Envelopes” on page 44, it is useful

to briefly introduce their use here.

The Filter Envelope varies the cutoff each time

you play a note, according to the Attack Decay,

Sustain, Time, and Release settings.

The Envelope control determines the degree to

which the envelope affects filter cutoff. The

greater the Envelope amount, the greater the ef-

fect the filter envelope has on cutoff frequency.

To hear the effect of the filter envelope:

1 Reset the patch to its original state by choos-

ing Tutorial Sounds > Tutorial 3 Sound from the

Librarian menu.

2 Set filter 1 Resonance to 64.

3 Set the filter 1 Cutoff to 64.

4 While repeatedly playing a note, increase

filter 1 Envelope to 64. Note how the effect

changes.

5 Experiment with different Cutoff, Resonance

and Envelope settings.

The Envelope control has no effect if a filter

is already completely open.

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