Yamaha SPX900 SPX900 Owners Manual Image - Page 14

SOUND

SOURCE

LIS.POSI.

HEIGHT

Input

signal

TRG

LEVEL

Reverb

output

HOLD

TIME4-1

Release

MIDI

Trigger

(MIDI

TRG.):

OFF,

ON

When

this

parameter

is

turned

ON,

a

KEY

ON

EVENT

message

from

an

external

MIDI

keyboard

can

be

used

to

trigger

the

gate.

A

KEY

ON

EVENT

message

is

transmitted

whenever

a

note

on

a

MIDI

keyboard

is

played.

NOTE:

This

effect

can

also

be

triggered

by

the

front

-panel

TRIGGER

key

or

a

footswitch

plugged

into

the

rear

-panel

TRIGGER

jack.

ECHO

ROOM

REVERB

PROGRAMS

•

6.

REV6

WHITE

ROOM

II

11.

REV11

TUNNEL

•

12.

REV12

CANYON

III

13.

REV13

BASEMENT

This

is

a

special

type

of

reverberation

in

which

you

have

extensive

control

over

the

room's

dimensions

and

other

parameters.

PARAMETERS

ACCESSED

BY

THE

PARAMETER

KEY

Reverb

Time

(REV

TIME):

0.3

—

100.0

seconds

The

length

of

time

it

takes

for

the

level

of

reverberation

at

1

kHz

to

decrease

by

60

dB

—

virtually

to

silence.

In

a

live

setting,

this

depends

on

several

factors:

room

size,

room

shape,

type

of

reflective

surfaces,

and

others.

Room

Width

(WIDTH):

0.5

—

34.0

meters

Room

Height

(HEIGHT):

0.5

—

34.0

meters

Room

Depth

(DEPTH):

0.5

—

34.0

meters

These

parameters

make

it

possible

to

specify

the

main

dimensions

of

the

echo

room

in

meters.

Basically,

the

larger

the

dimensions

of

the

room

the

longer

the

reverb

sound.

REgR

Wall

Variance

(WALL

VARY):

0

—

30

Irregularity

factor

refers

to

the

relationship

of

the

wall

surfaces

in

the

echo

room.

At

a

setting

of

1

all

walls

are

parallel.

Higher

settings

increase

the

angles

between

the

wall

surfaces,

causing

a

distinct

change

in

the

reverb

sound.

Listening

Position

(LIS.

POST.):

FRONT,

CENT.,

REAR

Allows

position

the

"listener"

to

the

front,

center

or

rear

of

the

echo

room

in

relation

to

the

source

sound.

High

Frequency

Reverb

Time

Ratio

(HIGH):

x0.1

-

x1.0

Natural

reverberation

varies

according

to

the

frequency

of

the

sound.

The

higher

the

frequency,

the

more

sound

tends

to

be

absorbed

by

walls,

furnishings

and

even

air.

These

two

parameters

allow

alteration

of

the

high

-frequency

and

low

-

frequency

reverb

times

in

relation

to

the

overall

reverb

time.

Diffusion

(DIFFUSION):

0

-

10

The

complexity

of

the

many

reflections

that

make

up

reverberation

varies

according

to

the

shape

of

the

room

and

its

contents.

In

the

SPX900

the

term

"diffusion"

refers

to

the

complexity

of

these

reflections.

If

the

DIFFUSION

parameter

is

set

to

"0,"

minimum

complexity

and

therefore

a

clearer,

more

straightforward

reverb

effect

is

produced.

As

the

DIFFUSION

value

is

increased,

the

complexity

of

the

reflections

increases

producing

a

thicker,

richer

sound.

Initial

Delay

(INI

DLY):

0.1

—

200.0

milliseconds

This

represents

the

time

delay

between

the

direct

sound

of

an

instrument

in

a

concert

hall

and

the

first

of

the

many

reflections

that

make

up

reverberation.

High-pass

Filter

Frequency

(HPF

FRQ.):

THRU,

32

Hz

—

1.0

kHz

Permits

rolling

off

the

low

-frequency

content

of

the

reverb

signal

above

the

set

frequency.

The

HPF

is

OFF

when

set

to

THRU.

Low-pass

Filter

Frequency

(LPF

FRQ.):

1.0

-

16

kHz,

THRU

Same

as

other

reverbs.

Width

Fine:

-100

—

+100

This

sets

the

value

specified

with

WIDTH

as

the

reference

value

(0)

and

is

the

parameter

for

fine

adjustment.

12

Yamaha SPX900 SPX900 Owners Manual Image - Page 14

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