Multimoog Musical Instrument Manual de Serviço descarregar pdf (Página 61)

If

zero

volts

is

fed

into

the

FILTER

INPUT,

no

change

of

the

cutoff

frequency

is

caused.

A

positive

voltage

applied

to

the

FILTER

INPUT

raises

the

cutoff

frequency,

like

clockwise

movement

of

the

CUTOFF

knob.

A

negative

voltage

applied

to

the

FILTER

INPUT

lowers

the

cutoff

frequency,

like

counterclockwise

movement

of

the

CUTOFF

knob.

Nominally,

a

change

of

one

volt

at

the

FILTER

INPUT

will

cause

a

change

of

one

octave

in

the

cutoff

frequency

of

the

FILTER

section.

In

practice,

only

about

.95

volts

is

required

to

create

this

change

because

the

input

is

designed

to

be

slightly

over-sensitive.

This

prevents

your

having

to

amplify

incoming

signals;

the

sensitive

input

will

more

jikely

require

attenuat/on

(lessening)

of

the

signal

with

a

simple pot

requiring

no

power

supply.

Signals

fed

into

the

FILTER

INPUT

add

to

internaPcontrol

signals

to

control

the

FILTER

section.

Because

external

and

internal

control

signals

are

additive,

you

could

use

a

Moog

Accessory

like

the

1120

Pedal

Control

Source

in

conjunction

with

the

FILTER

CONTOUR.

OSC

A&B

INPUT

The

OSC

A&B

INPUT

(oscillators

control

input)

acts

only

as

an

input

for

signals

capable

of

controlling

the

frequency

(pitch)

of

both

oscillators.

A

control

signal

fed

into

the

OSC

A&B

INPUT

acts as

an

"unseen

hand"

that

electrically

manipulates

internal

control

elements

as

one

might

do

manually

on

the

control

panel.

The

best

analogy

to

manual

control

is

move

ment

of

the

WIDE

FREQ

knob

when

the

OCTAVE

selector

is

in

the

rightmost

position.

The

following

illustrates:

RELATIONSHIP

BETWEEN

EXTERNAL

AND

MANUAL

OSCILLATOR

CONTROL

CONTROL

SIGNAL

OSCILLATORS

A&B

CONTROL

INPUT

^00

m

nc

10

AUDIO

HI

AUDIO

I

S-IRIG

-OUTPUTS

KBO

GUDf

MODULATION

FIUE8

OSC

US

FORCE

-J

l-ON/OFFCONTROLJ

I

S-TKS

INPUTS-

AUDIO

TOUCH

MOO

EFFECTS

ACCESSORY

POWER

HUE

TIKE

FRONT

PANEL

I

f

zero

volts

is

fed

into

the

OSC

A&B

INPUT,

no

change

of

oscillators

pitch

is

caused.

A

positive

voltage

applied

to

the

input

raises

pitch,

like

clockwise

movement

of

the

WIDE

FREQ

knob.

A

negative

voltage

applied

to

the

input

lowers

pitch,

like

counterc/odcw/se

movement

of

the

WIDE

FREQ

knob.

Nominally,

a

change

of

one

volt

at

the

OSC

A&B

INPUT

will

cause

a

change

of

one

octave

in

the

frequency

of

the

oscillators.

In

practice,

only

about

.95

volts

is

required

to

create

this

change

because

the

input

is

designed

to

be

slightly

over-sensitive.

This

prevents

your

having

to

amplify

incoming

signals;

the

sensitive

input

will

more

likely

require

attenuation

(lessening)

of

the

signal

with

a

simple

pot

requiring

no

power

supply.

Signals

fed

into

the

OSC

A&B

INPUT

add

to

internal

control

signals

to

control

oscillator

fre

quency.

Because

external

and

internal

controls

are

additive,

you

could

use

a

Moog

accessory

such

as

the

1130

Drum

Controller

in

conjunction

with

the

keyboard.

TOUCH

MOD

EFFECTS

Allows

input

of

external

signal

into

the

MOD

path

of

the

KEYBOARD

TOUCH

section

(in

lieu

of

MODULATION

section

signal).

Functional

only

when

the

EFFECT

switch

on

front

panel

is

in

MOD

position.

66

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