Yamaha REV7 REV7 Owners Manual Image - Page 13

EXPLANATION

OF

PARAMETERS

The

preset

programs

in

the

REV7

fall

into

the

following

types:

REV

(Reverb),

E/R

(Early

Reflection),

Delay,

Echo,

and

MOD

(Modulation

Type,

including

Phase,

Chorus,

and

Flange

type

effects).

Each

of

these

program

types

has

a

specific

selection

of

pro-

grammable

parameters.

"Parameters"

indicates

the

separate,

individual

functions

that

make

up

each

effect.

There

are

two

types

of

parameters

in

the

REV7:

"invisible"

parameters

(non

-programmable,

fixed

value

parameters)

and

programmable

parameters

(the

ones

that

you

can

edit,

or

modify).

You

can

set

the

parameters

of

two

different

presets

to

the

same

values,

and

the

resulting

effect

may

not

be

the

same,

due

to

the

non

-programmable

parameters.

Each

preset

has

up

to

7

programmable

parameters.

They

are

listed,

with

their

preset

values,

in

the

MEMORY

(ROM)

CONTENTS

CHART

at

the

end

of

this

manual.

In

this

section

we'll

explain

these

parameters

and

list

their

individual

value

ranges.

The

front

panel

key

which

calls

up

each

parameter

will

also

be

noted.

These

include

R/T

(Reverb

Time

—may

be

used

for

other

parameters),

INITIAL

DELAY,

1ST

REF

(First

Reflection:

a

double

-action

key

for

setting

level

and

delay

of

first

reflection),

and

Function

Keys

Fl,

F2,

F3

(for

a

variety

of

functions,

depending

on

preset

selected).

All

presets

include

the

1st

Reflection

feature,

explained

below.

The

level

of

the

1st

Reflection

is

usually

preset

at

zero,

so

that

you

can

program

in

just

the

amount

of

1st

Reflection

that

you

need.

REV

TYPE

Reverberation

effects.

Presets

1

through

4,

16

through

18,

22,

and

29.

(dB)

DIRECT

SIGNAL

/

100%

1ST

REF.

LEVEL

1ST

REFLECTION

REVERB

SIGNAL

60dB

1ST

REF.

DELAY

INITIAL

DELAY

REVERB

TIME

4

(TIME)

1.

REVERBERATION

TIME

(R/T).

Range:

0.3

—

10.0

sec.

Key:

REV

TIME.

The

length

of

the

time

it

takes

for

the

level

of

reverbera-

tion

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,

among

others.

2.

INITIAL

DELAY.

Range:

0.1

-

100

msec.

Key:

INITIAL

DELAY.

For

a

listener

in

a

concert

hall,

there

is

a

time

delay

be-

tween

the

direct

sound

of

the

instrument,

and

the

first

of

the

many

reflected

sounds

that

together

are

known

as

reverberation.

On

the

REV7,

this

is

known

as

the

INI-

TIAL

DELAY

time.

3.

1ST

REFLECTION

Delay.

Range:

0.1

-

100

msec.

4.

1ST

REFLECTION

Level.

Range:

0

^j

100%

of

direct

signal

level.

Key:

1ST

REF.

A

common

phenomenon

in

a

concert

hall

is

a

single.

reflection

immediately

after

the

direct

sound.

The

1ST

REFLECTION

feature

enables

you

to

accurately

simul-

ate

this

effect.

Both

the

delay

and

the

level

of

the

reflec-

tion

are

adjustable.

This

is

also

useful

for

A.D.T.'

(Auto-

matic

Double

Tracking)

effects,

or

for

"thickening"

the

sound

of

an

instrument.

The

1st

Reflection

is

always

a

mono

signal,

and

appears

in

the

center

of

the

stereo

image.

With

all

presets,

the

1ST

REF

parameters

are

pre-

set

at

the

minimum

(0%

level,

0.1

msec

delay

time)

so

that

you

can

program

in

exactly

the

amount

of

1st

Reflection

you

need.

NOTE:

The

1ST

REF

key

is

a

double

action

key.

Each

time

you

press

this

key,

it

alternates

between

"1ST

DLY"

and

"1ST

LEVEL"

(as

displayed

on

the

LCD),

allowing

you

to

set

the

values

of

the

delay

and

level

of

the

first

reflection.

5.

HI

REVERB

TIME.

Range:

0.1

'-

1.0

x

MID

R/T.

Key:

Fl.

6.

LOW

REVERB

TIME.

Range:

0.1

—

2.4

x

MID

R/T.

Key:

F2.

Natural

reverberation

varies

according

to

the

frequency

of

the

sound

—the

higher

the

frequency,

the

more

the

sound

tends

to

be

absorbed

by

walls,

furnishings,

and

even

by

air.

These

two

parameters

permit

you

to

alter

the

reverberation

times

of

the

high

frequency

and

low

frequency

portions

of

the

signal,

as

a

proportion

of

the

mid

frequency

reverb

time.

7.

DIFFUSION.

Range:

0

10.

Key:

F3.

Reverberation

is

caused

by

multiple

reflections

that

increase

rapidly

in

complexity,

according

to

the

shape

of

the

hall

and

any

furniture

or

fittings

therein.

This

rate

of

increase

is

known

as

DIFFUSION

on

the

REV7.

Setting

the

Diffusion

parameter

at

0

gives

a

less

complex,

clearer

reverb

effect,

as

in

a

regularly

shaped

room

with

simple,

flat

reflective

surfaces.

As

you

increase

the

setting,

the

sound

becomes

fuller,

richer,

and

more

expansive,

giving

the

impression

of

a

room

that

is

not

necessarily

bigger,

but

has

an

irregular

shape

and

contains

many

corners

and

fittings

to

multiply

reflections,

as

in

a

theater

with

proscenium,

seats,

orchestra

pit,

balconies,

etc.

12

Yamaha REV7 REV7 Owners Manual Image - Page 13

Explanation, Parameters

Page 13 highlights