Oberheim GM-1000 Manuel utilisateur

24 BIT DIGITAL SIGNAL PROCESSOR

GM-1000

OPERATING MANUAL

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

WARNING! TO REDUCE THE DANGER OF ELECTRIC SHOCK:

DO NOT REMOVE COVER (OR BACK)

DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE

NO USER SERVICEABLE PARTS INSIDE

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL

This simbol is intended to

alert the user to the presence

of important operating and

maintenance (servicing)

instructions in the literature

accompanying the appliance.

This simbol is intended to alert

the user to the presence of

uninsulated “dangerous

voltage“ within the product’s

enclouser that may be of

sufficient magnitude to

constitute a risk of electronic

shock to persons.

“INSTRUCTIONS PERTAINING TO A RISK OF FIRE,

ELECTRIC SHOCK, OR INJURY TO PERSONS“

IMPORTANT SAFETY INSTRUCTIONS

“INSTRUCTIONS PERTAINING TO A RISK OF FIRE,

ELECTRIC SHOCK, OR INJURY TO PERSONS“

IMPORTANT SAFETY INSTRUCTIONS

WARNING: When using electric products, basic precautions should always be

fallowed, including the following:

1) Read all instructions before using the product.

2) To reduce risk of injury, close supervision is necessary when product is used near

children.

3) Do note this product near water – for example, near a batnub, washbowl, kitchen

sink, in a wet basement, or near a swimming pool, or the like.

4) This product, either alone or in combination with an amplifier and headphones or

speakers, may be capable of producing sound levels that could cause permanent

hearing loss. Do not operate for a long period of time in high volume level or at a

level that is unconfortable. If you experience any hearing loss or ringing in the

ears, you should consult an audiologist.

5) This products should be located away from heat sources such as radiators, heat

6) The power supply cord of the instrument should be unplugged from the outlet

when left unused for a long period of time.

7) Care should be taken so that objects do not fall and liquids are not spilled into the

enclosure of the instrument.

8) The products should be serviced by qualified personnel when:

a. The power supply cord or the plug has been demaged; or

b. Objects have fallen, or liquid has been spilled into the product; or

c. The products has been exposed to rain; or

d. The products does not appear to operate normally or exibist a marked

change in performance; or

e. The products has been dropped, or the enclosure demaged.

9) Do not attemp to service the product beyond that described in the user-

maintenance instructions. All other servicing should be referred to qualified

personnel.

OBERHEIM GM 1000

Digital Signal Processor

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CONTENTS

1. Introduction

1.1 Precautions ............................................................................................ page 81

2. Description of controls and connectors

2.1 Front panel ............................................................................................ page 82

2.2 Rear panel ............................................................................................ page 83

3. Installation and instructions for use

3.1 Connection examples ............................................................................ page 84

3.2 Some advice about correct use of the GM 1000 ................................... page 85

3.3 Structure of the GM 1000 ...................................................................... page 86

4. Play mode

4.1 Keys and controls .................................................................................. page 88

4.2 Selecting a memorized patch ................................................................ page 89

4.3 Programming ......................................................................................... page 89

5. Edit mode

5.1 Keys and controls .................................................................................. page 91

5.2 Master level ........................................................................................... page 93

5.3 Memorizing a patch ............................................................................... page 94

6. Effects:

6.1 Compressor (CMP) ................................................................................ page 95

6.2 Distortion (DST) ..................................................................................... page 101

6.3 Equalizer (EQ) ....................................................................................... page 103

6.4 Amp simulator (AMP) ............................................................................. page 107

6.5 Modulation (MOD) ................................................................................. page 109

6.6 Special effects 1 (SP1) .......................................................................... page 114

6.7 Special effects 2 (SP2) .......................................................................... page 119

6.8 Delay (DLY) ........................................................................................... page 125

6.9 Reverberation (REV) ............................................................................. page 132

6.10 Noise gate (NG) ................................................................................... page 140

6.11 The Midi Foot Controller page ............................................................. page 140

OBERHEIM GM 1000

Digital Signal Processor

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7. Utility Mode:

7.1 Midi Settings........................................................................................... page 142

7.2 Program Table ....................................................................................... page 144

7.3 Dump ..................................................................................................... page 144

7.4 Midi Monitor ........................................................................................... page 145

8.Tools

8.1 Tuner ..................................................................................................... page 146

8.2 Analyzer ................................................................................................. page 147

9. Tips and Tricks

9.1 Level and digital technology...................................................................page 150

9.2 Programming..........................................................................................page 151

9.3 Writing the patches.................................................................................page 151

10 Initialization procedure:

10.1 Factory settings....................................................................................page 153

10.2 Dsp self-test .........................................................................................page 153

11. Annex:

11.1 The types of connectos used................................................................page 154

11.2 Glossary of terms used.........................................................................page 154

12. Technical specifications ......................................................................page 155

OBERHEIM GM 1000

Digital Signal Processor

- 81 -

1. INTRODUCTION

1.1 PRECAUTIONS

The following is a list of a number of simple precautions to be adopted when using and

maintaining the instrument in order to avoid damage to its mechanical and electronic

structures:

•To avoid the risk of electric shock, never make the connections or use the instrument

with wet hands.

•Never apply excessive force to the instrument's mechanical parts and keys.

•Do not stress the instrument in transit or during use.

•Do not place the instrument close to heat sources, in excessively damp or dusty places

or close to strong magnetic fields.

•When possible, do not place the instrument close to units which generate strong

interference, such as radio and TV sets, monitors, etc.

•Never insert foreign bodies or liquids of any kind inside the instrument, for any reason.

•Never use solvents on the instrument's finishes. To clean, use only a soft cloth dipped

in water.

•The inside of the instrument does not contain any parts requiring maintenance by the

user. Never attempt to carry out repairs or modifications to the instrument; always

contact qualified personnel for any repairs.

•Only connect foot-switches with normally open contact. Prolonged use of unsuitable

pedal units causes serious damage to the instrument's electronic components.

•Use the power supply lead supplied or an equivalent with earth. Never use the

instrument unless it is connected to an adequate earth connection. Before making the

connection, check that the mains voltage is as indicated on the body of the adaptor.

•Disconnect the power supply lead from the mains socket if the instrument is to be out of

use for long periods.

OBERHEIM GM 1000

Digital Signal Processor

- 82 -

2. DESCRIPTION OF CONTROLS AND CONNECTORS

2.1 FRONT PANEL

1. Phones Output: this socket is a headphones output which allows the GM 1000 to

be used even without connection to an amplification system.

2. Phones Level: used to regulate the volume of the signal sent to the PHONES

OUTPUT.

3. Input Level: LED indicator for the input signal level.

4. Display: backlit display used to display various information, such as the number

and name of the memory to be used, the programming parameters, the sound

spectrum analysis data, etc.

5. Value: data input device which can be used to vary the values selected using the

cursor keys. Turn clockwise to increase the selected value or anti-clockwise to

decrease.

6. Guitar Input: dedicated input connector for a guitar.

7. Input Level: regulates the amount of signal supplied as input to the GM 1000. The

setting applies to both the front and rear connectors.

8. Midi message: light indicating that the rear Midi In connectors are receiving midi

messages.

9. Lcd Contrast: regulates the contrast of the liquid crystal display (LCD).

10. Function keys: keys which allow the user to carry out the main functions necessary

for use and programming of the GM 1000.

11. Cursor: the four illuminated green keys allow the user to move the cursor around

the display in order to select a parameter for modification.

12. Group keys: keys used for selecting the groups which make up the sound

processing chain.

13. Tools keys: these keys allow access to the Bypass, tuner and spectrum analyzer

functions implemented in the GM 1000.

14. Power key: key used for switching the instrument on and off.

678

1 2 4

10 11 12 13 14

OBERHEIM GM 1000

Digital Signal Processor

- 83 -

2.2 REAR PANEL

15. Pre-Post switch: selects where the volume control intervenes.

16. Volume connector: connector for connection of a volume pedal.

17. Hold Switch: jack for connection of an optional foot-switch which activates the hold

delay function (infinite repetition of a memorized phrase).

18. Tap Switch: jack for connection of an optional foot-switch allowing the tap delay

speed to be set.

19. Foot Controller: connector for connection of the optional Oberheim FC 3000 foot

controller.

20. Midi In 1 and 2: five pin DIN connectors for reception of Midi messages from a

remote Midi source.

21. Ac Input: connector for connection of the power supply lead supplied with the

instrument.

22. Midi Thru 1 and 2: five pin DIN connectors which retransmits the MIDI codes as

output exactly as they are received by the Midi In connectors. Used to create a

chain of Midi devices.

23. Midi Out: five pin DIN connector for transmission of Midi messages generated by

the GM 1000.

24. L/Mono - R Input: jacks for connection of a remote source to the GM 1000. There

is a choice between a stereo connection, using the two inputs simultaneously (the

recommended option) and a mono connection using the L/Mono connector only.

The front Guitar Input connector has precedence over the rear Input connectors.

These connectors are of unbalanced type.

25. L/Mono - R Output: the signal processed by the GM 1000 leaves the instrument

from these two jacks. There is a choice between a stereo connection, using the two

inputs simultaneously (the recommended option) and a mono connection using the

L/Mono connector only. These connectors are of unbalanced type.

26. L - R XLR Input: balanced Cannon XLR connections for connection of a remote

source to the GM 1000. Use this connectors in a stereo configuration

27. L - R XLR Output: the signal processed by the GM 1000 leaves the instrument

from these two balanced Cannon XLR connectors. Use this connectors in a stereo

configuration

15 18

21 22 24

17 19 20

23 25 26 27

OBERHEIM GM 1000

Digital Signal Processor

- 84 -

3. INSTALLATION AND INSTRUCTIONS FOR USE

3.1 CONNECTION EXAMPLES

Audio connections:

•use only good quality screened cables.

•make the audio connections first and then the mains connection.

Mixer

Send Return

P.A.

System

P.A.

System

A/C current

Foot-

switches

P.A.

System

Ampli

P.A.

System

Ampli

Keyboard

Mixer effects send

Guitar amplifier effects send

Fc 3000

foot-controller

(optional)

Midi Unit

Midi Controller

Midi Out Midi In

Headphones Guitar

Volume

pedal

OBERHEIM GM 1000

Digital Signal Processor

- 85 -

3.2 SOME ADVICE ABOUT CORRECT USE OF THE GM 1000

Switch-on.

Before making all the connections make sure that the amplification system volume is

turned down to the minimum setting. Switch on the GM 1000 and then adjust the system

volume again. Otherwise, always switch on the GM 1000 first and then the amplification

system.

Input level.

Each instrument has its own output level which may vary depending on circumstances. In

order to obtain the best performance from the GM 1000, the input level must be adjusted

to suit the instrument connected. This simple procedure will ensure that the right amount

of signal is sent to the effects processor in order to avoid distortion if the signal is too

strong or hissing if the signal is too weak.

Start the operation by turning the input trimmers to zero and send a signal to the GM 1000.

Start to turn the Input trimmers clockwise until the signal illuminates the Input Level LED

meter; the optimum operating range is between -12 dB and -3 dB.

Output level.

The MASTER LEVEL (general output level) shown on the main video page must be

regulated in the same way as the input level in order to adapt the output volume to that of

the equipment connected to the OUTPUT(S). Since this parameter can also be

memorized, more details of how it operates will be described in later sections.

Digital technology and levels.

The GM 1000 is an all-digital instrument: this means that some simple rules have to be

followed during programming. In the digital technology, the maximum permitted dynamic

threshold is 0 dB; above this level, even if it is only reached and exceeded for one

moment, so-called digital distortion is created. Digital distortion has nothing to do with the

distortion often required by guitarists, and generates an extremely unpleasant effect often

mistakenly thought to be a real malfunction of the equipment. Since the GM 1000 is

equipped with filters with an operating range of +/- 14 dB and it is possible to add together

the action of a number of filters operating simultaneously, the threshold of 0 dB may be

exceeded. This must therefore be borne in mind when programming the GM 1000, with

frequent checks on the amplification gain introduced by the filters mentioned above by

means of the bypass functions described in the PLAY MODE and EDIT MODE sections.

Adjusting the display contrast.

The GM 1000 is equipped with a large backlit LCD (liquid crystal display). In view of the

characteristics of the LCD system, the contrast has to be adjusted to suit the angle from

OBERHEIM GM 1000

Digital Signal Processor

- 86 -

which the operator looks at it. A trimmer marked CONTRAST on the left of the panel is

provided for this purpose.

3.3 STRUCTURE OF THE GM 1000

Memory configuration.

The memory of the GM 1000 is divided into four banks: A, B, C and D.

Each of them contains 128 memory locations (which from now on we will call patches),

giving a total of 512. They are all at the disposal of the user, who can program them as

preferred.

The original factory programming settings for the 128 patches in bank A are maintained

permanently in a separate memory and can be recalled at any moment using a special

procedure described in point 8.1 FACTORY SETTINGS.

Groups and effects.

The GM 1000 is designed to process the signal with up to 9 EFFECTS which can be

programmed at any one time. In addition, there is also a constantly active, programmable

Noise Gate (NG).

The effects are obtained by means of more than forty algorithms and are arranged into

categories or GROUPS.

Each group is able to contain up to 6 different effects of the user's choice, and only one of

them can be made active. There are 9 groups available, and this gives the maximum

number of effects which can be used simultaneously (plus the noise gate, which is always

active):

•COMPRESSOR (CMP): Compressor, Limiter, Expander, DeEsser-Ducker, Frequency

Selective Expander/Gate, Dynamic Processor.

•DISTORTER (DST): Distortion, Overdrive, Crunch.

•EQUALIZER (EQ): 10 Bands Graphic EQ, Mono Parametric, Guitar, 5 Bands Graphic,

Stereo Parametric.

•AMP SIMULATOR (AMP): Guitar, Bass.

•MODULATION (MOD): Chorus, Flanger, Phaser, Step Phaser, Tremolo, Vibrato.

•SPECIAL EFFECTS 1 (SP1): Wha-Wha, Comb Filter, Double Chorus, Ring Modulate,

Auto Pan, Fade In.

•SPECIAL EFFECTS 2 (SP2): Shifting Delay, 3 Voice Pitch Shifter, Custom Shift, 4

Voice Chorus, Rotary Speaker, Denoiser.

•DELAY (DLY): Standard Delay, Tap Delay, Stereo Delay, Multi Delay, Metronome 1

Delay, Metronome 2 Delay.

•REVERB (REV): Reverb, Gate Reverb, Virtual Chamber.

This can all be summed up by a simple chart:

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