ARP ODYSSEY Руководство - Страница 7

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6. The voltage controlled filter (VCF) is a

signal modifier. It alters the sound of signals

passing through it by selectively removing or

weakening their higher frequencies. Listening

to pink noise, with the settings as in Figure K,

move the

VCF freq

slider slowly down as far

as it will go. You will hear first the highest

frequency components of the noise weaken

and disappear, then middle frequencies, and

finally even the lowest bass disappear until no

signal is audible at all.

Try

the same procedure

with signals from one or both of the VCO's

instead of pink noise.

Raise the

resonance

slider about halfway up,

as in Figure L, and repeat the experiment,

first with pink noise and then with an oscillator

signal.

With this resonance setting, the VCF

"peaks" sharply around a narrow range of

frequencies;

this is useful in creating various

"wa-wa" effects.

The

highest position of the resonance slider

labeled

"self osc" (Figure M ).

this position

the VCF

an oscillator just like one of the

VCO's and will produce an output

even

with

all

the

input sliders on the audio mixer closed.

In other words, it becomes a signal source

rather than a signal modifier.

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Page 10 ARP ODYSSEY

Voltage controlled filter

AUDIO

MIXER

Figure L

The

VCF resonance

can only be set manually.

The VCF frequency

can be set and changed

with control voltages as well as

hand;

using

noise as your

input

signal, open the

first

con-

trol input

attenuator all the way (Figure N)

and set the manual

VCF freq

slider about half-

way up. Now run

long

glissandos on

the

key-

board and

listen

the

noise grow alternately

brighter and

duller.

Close this attenuator and

open the next one to

introduce

control by the

LFO sine

output. (By this time, you should

develop the habit of experimenting with all

the relevant

controls for any functions

use;

this case, for example, you will want to hear

different

settings of the

L FO

frequency and

the VCF resonance and manual VCF

frequency

settings.)

Often you will want to control the

VCF

frequency

by the

ADSR

envelope

gen-

erators

order to create separate events with

their own attack and

decay

characteristics.

For an example of this, feed one of the VCO

signals into the audio mixer and move the

VCF

freq

slider all the way down. Open the third

con'trol attenuator under the VCF all the way

(all the other controls on your Odyssey ~hould

+rhus the HPF is "wide open" when the HPF Cutoff

Freq control is all the way down.

HPF

FREO

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control

inr:>ut

attanuators

Figure N

set as

Figure B), and play the keyboard.

Contrnue with various settings of the VCF

freq,

the third

attenuator, and the four con-

trols of the ADSR envelope generator.

general,

the

higher

the

setting of the

third

attenuator, the

lower

you will want to set the

VCF freq, and vice versa.

The high pass filter (HPF)

is another signal

modifier.

attenuates frequencies below the

setting of

its HPF

cutoff frequency slider and

thus is

exactly opposite in

its

effects to the

VCF which

low

pass filter.*

It is

useful in

eliminating "boominess"

from low

bass notes,

and

simulating certain

instrumental

sounds

(see Patch 6).

The HPF is not voltage con-

trolled.

The voltage controlled amplifier (VCA) is

the final signal modifier stage of your Odyssey

"assembly

line."

governs the volume of the

synthesizer's output.

The

most common way

of using the VCA is to set its

VCA gain

slider

all the way down and the control attenuator

all the way open. (See

Figure

O on page 12.)

Thus

the

VCA will allow signals to pass through

only when

is "instructed" to do so by one

of the envelope generators.

Highpass filter

Amplifier

ARP ODYSSEY Page 11