Multimoog Musical Instrument Manual de Serviço descarregar pdf (Página 38)

You

might

select

a

sound

source

and

try

the

above

settings

to

hear

the

shape

of

the

contour

produced.

It

is

important

to

remember

that

loudness

has

priority

over

other

aspects

of

sound.

After

all,

if

the

LOUDNESS

CONTOUR

and

its

related

switches

don't

allow

a

sound

to

be

heard,

it

hardly

matters

what

the

other

sections

of

the

Multimoog

are

doing.

FILTER

CONTOUR

SECTION

Most

musical

instruments

have

dynamic

timbral

characteristics—their

tone

color

changes

in

time.

The

Multimoog

provides

for

such

dynamic

timbre

control.

The

FILTER

CONTOUR

section

is

a

contour

(sometimes

called

"envelope")

generator.

Its

ATTACK

and

RELEASE

controls

may

be

set

to

produce

a

dynamic

control

signal that

"contours,"

or

moves

the

cutoff

frequency

of

the

VCF.

The

FILTER

CONTOUR

section

may

bethought

of

as

an

"invisible

hand"

that

moves

the

CUTOFF

control

for

you.

The

associated

FILTER

SUSTAIN

switch,

and

the

RELEASE

switch

select

the

ways

in

which

the FILTER

CONTOUR

section

works.

The

FILTER

CONTOUR

section

is

independent

from,

but

identical

in

its

operation

to

the

LOUDNESS

CONTOUR

section.

The

diagram

below

shows

the

general

form

of

the

signal

produced

by

the

FILTER

CONTOUR

section.

TYPICAL

CONTOUR

SIGNAL

KEY

DEPRESSED

KEY

RELEASED

TIME

IN

SECONDS

The

voltage

contour

may

have

three

parts:

the

rise

time

J^

\,

set

by

the

ATTACK

control;

the

sustain

level

/^^^\,

at

which

the

cutoff

frequency

may

be

held

when

the

FILTER

SUSTAIN

switch

is

to

the

left;

and

a

release

time

/

E

,

set

by

the

RELEASE

control.

The

FILTER

CONTOUR

is

a

controller

that

is

connected

to

the

control

input

of

the

voltage

controlled

FILTER

section.

Unlike

the

LOUDNESS

CONTOUR,

however,

a

means

is

provided

to

control

the

amount

of

sfgnal

that

is

allowed

to

reach

the

control

input.

This

means

is

the

CONTOUR

AMOUNT

control.

The

CONTOUR

AMOUNT

control

acts

to

attenuate,

or

lessen

the

amount

of

signal

allowed

into

the

control

input

of

the

FILTER

section.

Settings

closest

to

the

center

"0"

point

provide

greatest

attenuation

(least

signal).

Let's

explore

its

use:

EXERCISE

12:

DYNAMIC

TIMBRE—FILTER

CONTOURING

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 76 77

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