Multimoog Musical Instrument Manual de Serviço descarregar pdf (Página 42)

EXERCISE

14:

EXPLORING

THE

MODULATION

SECTION

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1.

Hold

down

the

lowest

key

on

the

keyboard.

Slowly

move

the

MOD

AMOUNT

wheel

fully

away

from

you

and

return.

You

should

hear

a

wide

bend

of

the

pitch

upward.

2.

Notice:

the

SOURCE

selector

is

in

the

BEND

position.

ROUTING

is

in

the

OSC

A&B

position.

3.

Place

the

ROUTING

selector

to

the

FILTER

position.

Hold

a

key

and

repeat

action

with

MOD

AMOUNT

wheel.

Now

the

filter

cutoff

frequency

is

being

"bent".

4.

Place

the

ROUTING

selector

to

the

\S

|

B

(waveshape)

position.

Hold

a

key

and

use

MOD

AMOUNT

again.

Now

the

waveshape

of

the

OSCILLATOR

B

section

is

being

moved.

SOURCE

is

a

rotary

switch

which

determines

the

source

of

modulation

signal;

it

"selects"

which

controller

is

to

be

used.

The

ROUTING

rotary

switch

determines

where

that

control

signal

will

go;

it

"routes"

it

to

the

appropriate

control

input(s).

The

MOD

AMOUNT

wheel

controls

the

amount

of

modulation.

Let's

examine

what

happened

in

the

previous

exercise

steps

more

closely.

Note

that

BEND

is

selected

as

the

controller

by

the

SOURCE

selector.

BEND

is

a

fixed

voltage

level,

like

a

battery.

BEND

is

routed

through

the

MOD

AMOUNT

wheel,

which

lets

uscon-

trol

its

amount.

When

the

MOD

AMOUNT

wheel

is

fully

forward

(toward

the

control

panel)

we

get

the

full

BEND

signal.

As

the

MOD

AMOUNT

wheel

is

moved

back,

there

is

progressive

attenuation

(reduc

tion)

of

the

signal.

When

theROUTING

control

issetto

the

OSC

A&B

position,

the

controller

(BEND)

is

routed

to

the

frequency

control

inputs of

the

oscillators.

As

you

move

the

MOD

AMOUNT

wheel

forward,

the

amount

of

voltage

let

through

increases

and

causes

oscillator

pitch

to

rise.

When

the

BEND

signal

is

routed

to

the

control

input

of

theFILTER

section,

thefilter

cut

off

frequency

is

moved

by

movingtheMOD

AMOUNT

wheeU-inally,

when

the

ROUTING

selector

was

in

the

\S

I

B

(WAVESHAPE

B)

position,

the

BEND

sig

nal

is

connected

to

the

waveshape

control

input

of

OSCILLATOR

B.

Then

movement

of

the

MOD

AMOUNT

wheel

is

analogous

to

movement

of

the

WAVESHAPE

control

for

OSCILLATOR

B.

It's

just

a

matter

of

deciding

what

type

of

controller

you

want

to

select

(SOURCE),

how

much

of

it

you

want

to

use

(MOD

AMOUNT),

and

which

section(s)

you

want

to

control

(ROUTING).

Continue

the

exercise:

47

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