ARP ODYSSEY Podręcznik - Strona 4

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HOW YOUR ODYSSEY WORKS

1. Most purely electronic musical instruments

work by generating certain kinds of "raw"

sounds from circuits called oscillators. These

raw sounds (not usually very pleasant or musi-

cal sounding by themselves) are then modified

by other circuits such as

filters

to make them

musically useful. In a very general way, th is is

how your Odyssey works,

but there are im-

portant differences.

2. One difference is that the synthesizer gives

you complete control over every step of the

process that turns a raw sound into an inter-

esting musical event or series of events.

All of the slide controls on the upper half of

your Odyssey control panel, for example,

re-

present forms of sound modification that

either do not exist on other electronic musical

instruments or are buried deep

inside

where

only a serviceman could reach them.

3. The biggest difference, however, is that

with your ARP Odyssey the process of whitt-

ling a raw sound into something musically in-

teresting can be controlled not only manually

but also, in several important

respects,

auto-

matically.

This is the principle of

voltage

control, which means controlling the operation

of your synthesizer by means of changing volt-

ages as well as changing slider positions. Some

the

circuits in your Odyssey exist only in

order to produce such control signals. (Some

of these are the sample/hold circuit,

the

two

envelope generators, the L

FO,

and the key-

board. )

a modern manufacturing plant many

operations such as drilling, milling, and

lathe

work will be controlled by computer. Most of

us have seen at one time or another a film of

this sort of thing-a piece of raw material being

locked into place and machined to a certain

size, with holes of a certain depth, width, and

placement-and so on. You can think of your

Odyssey as being such an "assembly

line"

for

the construction of sounds.

Page 4 ARP ODYSSEY

How it works: Voltage control

Audio signals

from

the

two voltage controlled

oscillators

(VCO 1

and

VCO

2), the noise gen-

erator,

and

ring modu-

lator are

mixed and

passed

rough the

volt-

age controlled filter,

the

high pass filter,

and the

voltage controlled

amp-

lifier

before

leaving

the

synthesizer.

The

output

of the

voltage

control-

ed amplifier

connect-

ed to the output jacks

on the back of your

Odyssey.

5. The

ARP

Odyssey

contains about a

dozen

separate pieces

equipment

(plus a few extra

controls

such as

the portamento

and

pitch

bend

controls

on the

far

left of

the

panel.)

These can be connected to each other in many

different ways by the switches and sliders to

produce thousands of different "assembly pro-

grams" or

patches.

Each patch requires:

a. at

least

one piece of equipment

gen-

erate

the raw

material from

which the sound

is to

made; i.e., a signal source.

b. at

least

one piece of equipment

to modi-

fy the

raw

material

and make

it usable;

i.e.,

signal modifier.

c. one or more pieces of equipment for

control

ing

the signal

.sources and signal

AUDIO

MIXER

VOLTAGE

1--~CONTROLLED•--~

FILTER

Keyboard

Control

from

Noise Gen

Voltage

S/H or Envelope

VCO 1 VCO 2 or Ring Mod or Pedal

LFO

Generators

AUDIO SIGNALS

CONTROL SIGNALS

modifiers;

i.e., control signal sources, some-

times simply

called

controllers.

The front

panel of

your

Odyssey

shows the

general assembly-line setup (Figure

A). Thus,

reach your amplifier and

loudspeaker

system,

a signal

must pass through

this"assembly line."

This

is the

heart

your

Odyssey.

using

the

sliders and switches of the audio mixer,

you

can select

the raw material

for processing

by the

voltage

controlled filter (VCF),

the

high

pass

filter (HPF),

and

the

voltage con-

trolled

amplifier

(VCA).

In the

next few pages,

we will

show you exactly

what

each part of

the

assembly

line

does by

itself;

the sample

patches

the

end of

the manual

show some

the

ways

they all

work

together.

HIGH

PASS

FILTER

VOLTAGE

• - - ~

CONTROLLED

AMPLIFIER

Envelope

Generators

AUDIO

OUTPUT

Figure A

Assembling a sound

ARP ODYSSEY Page 5