Sequential Prophet T8 Manuale utente

OPERATION

MANUAL

SEQUENTIAL

S55

cizcuic)

inc

MODEL

1008

Manual

No.

CM1008B

PROPHET-T8

SYNTHESIZER

OPERATION

MANUAL

Stanley

Jungleib

Sequential

Circuits,

Inc.

Sequential

Circuits,

Inc.

Nijverheidsweg

Llc

3051

North

First

Street

3641

Mijdrecht,

Netherlands

San

Jose,

California

95134-2093

02979-6211

408/946-5240

TELEX:

12721

SQNTL

TELEX:

364412

INTR

706

PROPHET-T8

SYNTHESIZER

OPERATION

MANUAL

Stanley

Jungleib

Manual

No.

CM1008B

Issued:

July,

1983

SEQUENTIAL

CIRCUITS,

INC.

All

rights

reserved.

Printed

USA.

The

contents

this

manual

are

the

property

Sequential

Circuits,

Inc.,

and

are

not

copied

reproduced

without

its

prior

written

permission.

Exception

made

for

reproduction

blank

panel

diagrams

and

memory

map

(in

Section

for

personal

use.

CM1008B

7/83

About

the

Prophet-T8

Early

1978

Sequential

Circuits

revolutionized

the

art

keyboard

synthesis

with

the

Prophet-5,

compact

but

powerful

instrument

for

the

performer.

Before

the

Prophet

appeared

was

not

possible

for

keyboardist

instantly

select

custom

synthesized

sounds

and

play

them

polyphonically.

Its

featured

programmability

used

emergin,

microcomputer

technology

control

five

complete

synthesizers

(termed

voices

fashioned

from

analog

integrated

circuits.

The

Prophet-5

allowed

instantaneous

program

recall

120

different

"programs"

(sounds).

thus

captured

the

attention

most

the

world’s

professional

synthesists,

becoming

"the"

programmable

polyphonic

syntheslzee

comparable

"the"

electric

organ

(Hammond)

and

"the"

electric

piano

Rhodes).

second

rendering

the

Prophet

concept

was

the

dual-keyboard

Prophet-19.

This

highly

versatile

instrument

provided

ten-voice

"Single"

mode

simultaneously

programming

two

five-voice

synthesizers

from

one

keyboard,

"Split"

control

from

separate

keyboards,

"Double"

operation

which

assigned

two

different

programs

one

keyboard.

The

-10

included

elaborate

polyphonic

sequencer

which

remembered

whatever

you

played.

The

Prophet-T8

integrates

the

most

proven

features

its

two

progenitors

with

wooden,

piano-like

keyboard

which

touch-sensitive

(hence,

the

"T")

three

ways.

First,

piano,

the

speed

which

key

pressed

can

control

both

loudness

and

timbre.

Unlike

piano,

the

speed

which

key

released

can

also

control

loudness

and

timbre:

this

velocity

sensitivity.

Beyond

this,

pressure

sensitivity

(sometimes

called

“after-touch")

engaged

after

key

depressed

and

can

used

individually

"bend"

each

key's

pitch

down,

modify

its

loudness,

timbre,

modulation

depth

rate.

This

new

keyboard

radically

enhances

for

synthesists

the

crucial

physical

basis

upon

which

expression

and

musicality

depend,

exponentially

multiplying

the

available

aural

resources.

The

Prophet-T8

actually

contains

eight

individual

synthesizers,

grouped

four

voices

the

Left

and

four

voices

the

Right.

Single

mode

all

eight

voices

are

programmed

sound

alike

(homophony)--with

pitch

differences

corresponding

(at

most)

eight

simultaneously-held

keys.

Split

and

Double modes,

the

four

homophonous

Left

and

Right

voices

are

progammed

for

different

sounds

which

are

played

either

separate

sides

simultaneously

over

the

whole

the

keyboard.

For

its

principle

sound

sources,

each

voice

contains

two

voltage-controlled

oscillators

(VCOs),

referred

OSC

and

OSC

and

white

noise

source

can

mixed

into

resonant

low-pass

voltage-controlled

filter

(VCF)

which

followed

voltage-controlled

amplifier

(VCA).

The

voice

timbre

and

dynamics

are

shaped

the

filter

frequency

and

amplifier

gain

parameters

which

are

varied

independent

ADSR

envelope

generators

and

the

various

modulation

sources

(which

include

velocity

and

pressure).

Furthermore,

the

envelope

RELEASE

knobs

actually

control

two

alternate

programmed

release

times

which

are

selected

with

the

SECOND

RELEASE

switch

footswitch.

This

allows

the

footswitch

assume

the

function

the

piano's

sustain

pedal,

switching

longer

release

time.

M1008B

7/83

iii

Supplementing

the

basic

voice

are

polyphonic

modulation

(POLY-MOD)

signal

routings

within

each

voice

that

allow

each

OSC

and

filter

envelope

generator

function

modulation

sources

applied

each

OSC

filter.

The

pressure

modulation

routings

are

also

fully

polyphonic,

that

is,

individual

each

note.

And

for

each

set

four

voices,

there

low-frequency

oscillator

(LFO)

whose

modulation

depth

adjusted

the

MOD

wheel

(or

key

pressure).

Finally,

the

PITCH

wheel

can

raise

lower

the

pitch

all

voices,

just

the

Left

Right,

the

same

interval.

The

term

"digital-analog

hybrid"

often

used

describe

the

Prophet

synthesizers.

means

that

instead

directly

controlling

the

analog

synthesizer

voices,

the

keyboard

and

most

controls

actually

input

"data"

microcomputer

system

which

turn

"programs"

the

voices.

The

Prophet-T8

actually

has

two

microcomputers.

One

micro-

computer

committed

processing

the

optical

(velocity)

and

pressure

sensors

the

keyboard.

The

second

microcomputer

generates

the

sixteen

independent

oscillator

control

voltages

(CVs)

and

the

sixteen

complex

(velocity

plus

ADSR)

envelopes.

The

computer

memory

provides

way

store

all

the

switch

and

knob

settings

which

form

program.

The

memory

retains

128

programs

(64

each,

Left

and

Right)

even

when

the

Prophet

turned

off,

thanks

small

battery

with

10-year

life.

Unlimited

program

storage

common

audio

cassettes

also

available

through

the

built-in

interface.

The

computer

system

also

keeps

the

voice

oscillators

tune.

Finally,

memory

also

makes

possible

the

670-note

polyphonic

real-time

sequencer.

The

Prophet-T8

includes

the

MIDI

keyboard-computer

interface.

This

system

being

adopted

increasing

numbers

manufacturers

standard

means

interconnecting

equipment.

For

example,

connecting

one

cable

between

any

two

MIDI

synthesizers

between

MIDI

sequencer

and

synthesizer

will

allow

one

play

the

other

and

switch

programs.

With

the

range

and

quality

its

sound,

multi-responsive

keyboard,

wealth

performance

features,

and

ergonomic

control

panel

encouraging

instant

editing

all

programmable

parameters,

this

latest

Prophet

promises

significant

development

the

first.

CM1008B

7/83

Table

Contents

INSTALLATION

1-0

GENERAL

1-1

HANDLING

1-1

1-2

LINE

VOLTAGE

SELECTION

AND

FUSING

1-3

POWER

CONNECTIONS

1-2

1-4

AMPLIFIER

AND

SPEAKER

CONSIDERATIONS

1-3

1-5

AUDIO

OUTPUTS

1-3

1-6

FOOTSWITCHES

1-3

1-7

CASSETTE

1-5

1-8

RECORD

ENABLE/PROTECT

1-5

1-9

MIDI

1-5

SECTION2

BRIEF

INSTRUCTIONS

2-0

PRESET

MODE

2-1

PROGRAM

EDIT

AND

RECORD

2-1

2-2

SEQUENCER

2-2

2-3.

KEYBOARD

2-2

2-4

CASSETTE

2-3

SECTION3

BASIC

OPERATION

3-0

GENERAL

3-1

POWER

3-1

3-2

PREPARATION

3-1

3-3.

PLAYING

3-2

3-4

PITCH

AND

MOD

WHEELS

3-4

3-5

TUNING

3-4

3-6

KEYBOARD

MODES

3-5

3-7

UNISON/TRACK

AND

GLIDE

3-5

3-8

SEQUENCER

3-7

3-9

CASE

DIFFICULTY

3-8

SECTIONS

PROGRAMMING

4-0

GENERAL

4-1

EDIT

MODE

4-2

MANUAL

MODE

4-3

RECORD

MODE

4-4

LINK

CM1008B

7/33

SYNTHESIZER

CONTROLS

GENERAL

5-1

VOICE

DESCRIPTION

5-1

OSCILLATOR

5-3

OSCILLATOR

5-4

OSCILLATOR

NOTES

5-5

MIXER

5-9

FILTER

5-9

FILTER

NOTES

5-10

AMPLIFIER

5-12

ENVELOPE

GENERATORS

5-12

ENVELOPE

GENERATOR

NOTES

5-14

VELOCITY

SENSITIVITY

5-16

VELOCITY

NOTES

5-16

LFO-MOD.

5-18

POLY-MOD

5-19

PRESSURE-MOD

5-20

CASSETTE

INTERFACE

GENERAL

6-1

RECORDER

AND

TAPE

SELECTION

6-2

PRECAUTIONS

6-2

SAVE

PROGRAMS

SEQUENCES

TAPE

6-3

LOAD

PROGRAMS

SEQUENCES

FROM

TAPE

RECORDER

COMPATIBILITY

TESTING

6-5

MIDI

INTRODUCTION

BASIC

OPERATION

INITIALIZATION

AND

MODES

KEYBOARD

INFORMATION

TUNE

PROGRAM

SELECT

PROGRAM

DUMP

TEMPERMENT

FACTORY

PROGRAMS

8-1

MAP

AND

PANEL

BLANKS

9-1

CM1008A

3/83

INSTALLATION

1-0

GENERAL

This

section

describes

installation

procedures

and

connections

which

can

made

the

back

panel

the

Prophet-T8.

See

Figure

1-0.

All

connectors

are

standard

1/4-inch

phone

jacks

(except

for

the

MIDI

jacks,

which

are

5-pin

DIN).

CAUTION!

not

connect

the

Prophet-T8

power

switch

power

before

following

the

instructions

below.

1-1

HANDLING

The

Prophet-TS

sophisticated

device

containing

state-of-the-art

microcomputer,

sensitive

analog

circuitry,

and

wooden

keyboard

action

surrounded

optical

and

mechanical

sensors.

The

instrument

should

treated

with

much

care

you

would

provide

acoustic

instrument.

Avoid

temperature

and

humidity

extremes.

Shock

constant

vibration

can

damage

the

keyboard

controls,

and

loosen

connectors

socketed

integrated

circuits.

you

expect

transport

the

Prophet-T8

regularly,

imperative

invest

professional

"road"

"flight"

case

for

it-

These

are

made

several

manufacturers

and

should

carried

your

music

dealer.

you

can't

find

case,

please

contact

the

SCI

Customer

Service

Department.

1-2

LINE

VOLTAGE

SELECTION

AND

FUSING

CAUTION!

Check

line

voltage

setting

before

switching

power

on.

Disconnect

power

before

switching

line

voltage.

The

Prophet-T8

has

receptacle

back

panel

which

its

three-wire

power

cable

attaches.

Adjacent

this

are

line

voltage

selector

switch

and

the

main

fuse.

Prophet-

T8s

shipped

the

U.S.

and

Japan

are

usually

set

the

factory

for

110V;

Europe,

220v.

CML0008A

3/83

1-1

CAUTION!

Never

switch

the

line

voltage

with

power

switched

on.

Check

the

voltage

selector

switch

the

back

panel.

the

selected

voltage

does

not

match

the

line

voltage,

disconnect

the

power

cord

and

switch

the

voltage

selector.

Replace

the

fuse

according

the

selected

line

voltage:

110V:

220v:

1/2A

1-3

POWER

CONNECTION

WARNING!

you

check

the

power

and

ground

interconnec-

tions

the

Prophet-T8

and

all

other

instruments

and

equipment

you

use

prevent

potentially

lethal

shocks.

Sequential

Circuits,

Inc.

not

responsible

for

any

equipment

failure

due

incorrect

power

connections,

and

not

liable

for

any

personal

injury

due

electrical

shocks

result

unsafe

grounding

practices.

The

Prophet-T8

comes

with

three-prong

power

plug

insure

safe

grounding

with

other

equipment.

The

ground

prong

connected

directly

the

metal

chassis.

Because

this

ground,

"ground

loop"

will

often

created

when

audio

cable

connected

between

the

Prophet-T

and

its

amplifier.

result,

low-level

hum

may

occur.

Defeating

the

ground

with

two-prong

adapter

will

usually

defeat

the

hum

but

this

practice

can

set

shock

hazard

between

the

units.

The

hum

level

will

depend

exactly

how

the

synthesizer

and

amplifier

are

connected

the

AC.

For

minimal

hum,

use

the

same

outlet

for

the

Prophet-T8

and

its

amplifier.

This

should

reduce

the

hum

acceptable

level.

Connect

the

power

cable

the

Prophet-T8.

Check

that

the

Prophet-T8

power

switch

off

position.

Connect

the

power

cable

properly-grounded

three-prong

outlet.

Don't

defeat

the

AC-ground.

Plug

all

other

equipment

such

effects

devices,

mixers,

amplifiers

and

recorders

into

the

same

outlet.

WARNING!

not

overload.

When

doubt,

consult

electrician.

you

probably

know,

many

older

buildings

and

clubs

are

notorious

for

their

poor

quality

wiring.

therefore

urge

you

use

one

the

several

"ground-checking"

devices

available

the

market

verify

connections.

1-2

CMI10008A

3/83

1-7

CASSETTE

Connect

TAPE

recorder

input

(MIC,

LINE

IN).

Connect

FROM

TAPE

recorder

output

(EAR,

MONITOR,

LINE

OUT).

Cassette

interface

operations

are

explained

Section

1-8

RECORD

ENABLE/PROTECT

The

PROTECT

setting

prevents

accidental

program

changes.

Unless

this

switch

set

ENABLE,

the

RECORD

switch

the

control

panel

will

not

operate.

For

information,

see

Section

Programming.

1-9

MIDI

Connect

the

OUT

jack

the

MIDI

IN of

the

sequencer,

slave

synthesizer,

other

MIDI

device.

Connect

the

jack

the

MIDI

OUT

the

other

MIDI

device.

For

information

MIDI,

see

Section

‘CM10008B

7/83

1-5

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