Multimoog Musical Instrument Manual de servicio descargar pdf (Pagina 32)

EXERCISE

8:

MODIFYING

A

WAVESHAPE

WITH

THE

FILTER

SECTION

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1.

Hold

down

any

key

on

the

keyboard.

You

are

listening

to

the

sound

of

an

unfiltered

sawtooth

waveshape.

2.

While

listening,

slowly

rotate

the

CUTOFF

control

counterclockwise.

Notice

that

the

sound

becomes

less

bright

and

buzzy,

and

eventually

becomes

muted,

and

finally

disappears

when

all

partials

are

cut

off.

The

diagrams

below

show

what

happens

to

a

sawtooth

waveshape

as

you

progressively

cut

off

the

"highs"

by

rotating

the

CUTOFF

control

counterclockwise:

7

6.

Move

the

EMPHASIS

control

to

"10."

Now

move

the

CUTOFF

control.

You

can

actually

hear

each

harmonic

in

the

sawtooth

waveshape

as

you

move

the

cutoff

frequency

through

it.

Now

you

can

confirm

that

the

sawtooth

waveshape

has

all

harmonics

of

the

harmonic

series.

The

EMPHASIS

control

is

used

to

emphasize,

or

feed

back

energy

right

at

the

cutoff

frequency.

This

makes

the

presence

of

harmonics

more

apparent

when

the

CUTOFF

control

is

moved.

Higher

EMPHASIS

settings

increase

the

height

of

a

resonant

peak

at

the

cutoff

frequency;

look

at

the

panel

graphics

by

the

EMPHASIS

control

for

an

illustration.

Maximum

emphasis

is

reached

at

position

"10."

When

the

EMPHASIS

control

is

set

high,

it

is

possible

to

hear

the

individual

harmonics

present

in

any

waveshape.

Continue

the

Exercise:

y

7.

Hold

down

a

key

on

the

keyboard.

Now

let's

explore

the

use

of

the

EMPHASIS

control:

8-

check

to

see

that

the

EMPHASIS

control

is

at

10.'

3.

Hold

down

a

low key

on

the

keyboard.

4.

Check

to

see

that

the

EMPHASIS

control

is

at

"O."

5.

Move

the

CUTOFF

control

throughout

its

positions.

Even

though

you

are

passing

through

harmonics

as

you

move

the

CUTOFF

control,

you

can't

distinguish

each

harmonic

as

the

the

cutoff

frequency

passes

through

it.

9.

Select

different

WAVESHAPE

(B)

settings

and

move

the

CUTOFF

control;

see

if

you

can

hear

the

harmonics

in

the

waveshape

as

the

cutoff

frequency

passes

through

them.

(END

EXERCISE)

Noise

may

be

filtered

to

produce

some

unusual

sound

effects.

Try

the

following

Exercise:

37

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 76 77

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