Yamaha SPX90 SPX90 Owners Manual Image - Page 13

MODULATION

STEREO

FLANGE

A

combination

of

Delay

and

LFO

(Low

Frequency

Oscillation)

modulation,

the

popular

Flanging

effect

can

dramatically

thicken

the

sound

of

keyboard

in-

struments,

or

produce

the

"aircraft"

sound

popular

among

guitarists.

Basically,

a

short

delay

time

is

varied

with

LFO

modulation

so

that

the

delayed

signal

moves

in

relation

to

the

direct

signal.

The

resultant

variations

in

pitch

and

stereo

imaging

are

known

as

"flanging".

1dB)

DIRECT

SIGNAL

MOD.

DEPTH

/

L(R)

RIL)

-4----).

I

I

MOD.

DELAY

TIME

(TIME)

1.

MOD

FREQ.

Range:

0.1

-

20.0

Hz

Sets

the

speed

of

modulation,

and

hence

the

rate

at

which

the

effect

varies.

2.

MOD

DEPTH.

Range:

0

—

100%

This

sets

the

amount

of

delay

time

variation,

thus

adjusting

the

"depth"

of

the

effect.

At

the

maximum

setting,

the

delay

time

is

varied

by

+/-4

msec.

3.

MOD

DELAY

TIME.

Range:

0.1

-

100

msec

This

sets

the

basic

delay

time

from

the

initial

direct

sound

to

the

flange

effect.

When

set

to

lower

than

1

msec,

more

high

-frequency

variation

is

produced,

while

a

setting

higher

than

3

msec

will

create

more

low

-frequency

variation.

4.

F.B.

GAIN.

Range:

0

—

99%

Sets

the

amount

of

flange

signal

which

is

fed

back

into

the

circuit

for

further

modulation.

This

controls

the

complexity

of

the

effect,

its

"strength,"

and

its

overall

decay

time.

CHORUS

With

the

Chorus

effect,

a

violin,

keyboard,

or

guitar

can

sound

like

an

entire

ensemble.

Chorusing

splits

the

incoming

signal

into

three

signals

placed

at

the

center,

left,

and

right

in

the

stereo

image.

Each

signal

is

delayed

slightly,

and

then

its

delay

time

and

level

are

modulated

by

the

LFO

(Low

Frequency

Oscillator).

(dB)

DIRECT

SIGNAL

AMPLITUDE

MODULATION

DEPTH

(TIME)

I

A

DELAY

MODULATION

DEPTH

1.

MOD

FREQ.

Range:

0.1

-'

20.0

Hz

Sets

the

delay

time

modulation

speed

(frequency).

2i

DELAY

MODULATION

DEPTH.

Range:

0

100%

This

sets

the

amount

by

which

the

delay

time

of

one

delay

signal

is

varied

in

relation

to

the

other.

At

the

maximum

setting,

the

delay

time

is

varied

by

+/-4

msec.

3.

AMPLITUDE

MODULATION

DEPTH.

Range:

0

—

100%

This

sets

the

amount

by

which

the

amplitude

(level)

of

the

input

signal

is

varied.

12

Yamaha SPX90 SPX90 Owners Manual Image - Page 13

Modulation

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