Multimoog Musical Instrument Manual de servicio descargar pdf (Pagina 23)

GUIDED

TOUR

In

this

sub-section

we

will

look

at

the

sound

sources,

modifiers,

controllers,

and

triggering

devices

found

on

the

Multimoog.

Exercises

are

presented

"by

the

numbers"

to

help

explain

specific

features.

You

might

skim

through

the

first

time

by

doing

just

the

exercises

before

reading

the

GUIDED

TOUR

thoroughly.

(Set

up

the

Sound

Chart

that

precedes

each

exercise;

follow

numbered

instructions

precisely

for

best

results.)

SOUND

SOURCES

The

OSCILLATOR

A

and

B,

FILTER,

and

NOISE

sections of

the

Multimoog

generate

different

audio

signals

in

order

to

create

three

classes

of

sound:

pitched,

clangorous

(bell-like),

and

non-pitched.

PITCHED

SOUNDS

We

hear

pitch

as

the

highness

or

lowness

of

a

sound.

The

piccolo

plays

high

pitches;

the

tuba

plays

low

pitches.

Our

perception

of

pitch

is

complex,

but

depends

mostly

on

how

frequently

and

regularly

pressure

waves

strike

our

ears.

When

you

were

a

kid,

you

probably

made

a

fake

"motor"

for

your

bicycle

by

attaching

a

piece

of

cardboard

so

the

spokes

struck

it

regularly.

You

probably

weren't

aware

that

you

were

illustrating

an

interesting

law

of

physics!

The

faster

you

pedal,

the

higher

the

pitch

of

the

sound

caused

by

the

spokes

striking

the

cardboard.

That's

because

the

individual

strokes

are

heard

more

frequently—

literally,

their

frequency

becomes

greater.

Frequency

is

expressed

in

"Hertz"

(abbreviated

Hz),

or

cycles

per

second.

The

symphony

orchestra

tunes

to

an

"A"

that

has

a

frequency

of

440

Hz;

standard

tuning

is

therefore

A=440

Hz.

Although

the

correspondence

between

frequency

and

what

we

perceive

as

"pitch"

is

not

perfect,

a

higher

frequency

is

generally

heard

as

a

higher

pitch.

OSCILLATOR

SECTION

The

primary

sources

of

pitched

sound

on

the

Multimoog

are

two

voltage

controlled

oscillators,

A

and

B,

with

associated

MASTER

A&B

controls.

Each

oscillator

generates

periodic—regularly

repeating—

electrical

patterns

that

the

speaker

can

translate

into

pitched

sounds.

The

following

exercise

illustrates

the

relationship

between

the

frequency

of

an

oscillator

(OSCILLATOR

B

in

this

case),

and

the

pitch

of

the

sound

it

creates:

EXERCISE

1:

OSCILLATOR

FREQUENCY/PITCH

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1.

Hold

the

lowest

key

on

the

keyboard

down.

The

frequency

of

the

oscillator

is

so

low

the

sound

is

heard

not

as

a

pitch,

but

a

series

of

clicks.

2.

Slowly

rotate

the

WIDE

FREQ

control

of

the

MASTER

A&B

section

clockwise

toward

"O."

As

you

increase

the

frequency

of

the

oscillator,

the

pitch

of

the

sound

becomes

higher.

3.

Return

the

WIDE

FREQ

control

to

"-5."

Slowly

play

up

the

keyboard.

Where

do

you

first

start

hearing

the

sound

as

a

note

with

definite

pitch?

4.

Select

the

8'OCTAVE

position.

5.

Tune

the

Multimoog

using

the

FINE

TUNE

control

on

the

rear

panel

to

match

thepitch

level

of

a

piano

or

organ

(or

another

tuning

source).

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