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Oberheim GM-400, Operating Manual

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Oberheim GM-400 Operating Manual Download Page 42

Oberheim GM 400

Digital Signal Processor

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108

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4 VOICE CHORUS

This is a further version of the Chorus featuring no less than 4 stereophonic lines (voices) to
give the effect the maximum "roominess" and depth.

Rate parameter.  Range: 0 - 100.

Regulates the modulation speed of the selected voice.

Pre-Delay parameter.  Range: 0 - 100

This parameter sets the effect delay time of the selected voice.

Voice parameter.  Range: 1 - 4

Selects which of the 4 lines is to be modified.

Depth parameter.  Range: 0 - 100

This parameter regulates the modulation depth for each voice selected.

Level parameter.  Range: 0 - 100

Regulates the level of the selected voice.

Direct Level parameter.  Range: 0 - 100

Regulates the level of the direct signal.

Level parameter.  Range: 0 - 100

Regulates the level of the output signal in the context of the effects chain, in this case the sum
of the processed sound and the direct sound, mixed by means of the LEVEL parameter of the
1st editing page of the effect and the DIRECT LEVEL parameter.

6.8 DELAY  (DLY)

The group includes:

Summary of Contents for GM-400

Page 1: ...VISCOUNT JOINT VENTURE Oberheim GM 400 DIGITAL SIGNAL PROCESSOR OPERATING MANUAL...

Page 2: ...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 producin...

Page 3: ...77 4 Play mode 4 1 Keys and controls page 78 4 2 Selecting a memorized patch page 79 4 3 Programming page 80 5 Edit mode 5 1 Keys and controls page 81 5 2 Master level page 84 5 3 Memorizing a patch p...

Page 4: ...Table page 128 7 3 Dump page 129 7 4 Tuner page 130 8 Initialization procedure 8 1 Factory settings page 131 8 2 Dsp self test page 132 9 Annex 9 1 Types of connectors used page 133 9 2 Glossary of te...

Page 5: ...quids 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...

Page 6: ...Display backlit display consisting of 2 lines of 40 characters each used to display various information such as the number and name of the memory to be used the programming parameters or the input lev...

Page 7: ...reate a chain of Midi devices 22 L Mono R Input jack for connection of a remote source to the GM 400 There is a choice between a stereo connection using the two inputs simultaneously the recommended o...

Page 8: ...Mains connection make sure that the mains voltage is as indicated on the instrument to disconnect the power supply always take hold of the adaptor and do not pull on its lead Mixer Ch Input P A System...

Page 9: ...he GM 400 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 distort...

Page 10: ...l 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...

Page 11: ...s and are arranged into categories or GROUPS Each group is able to contain up to 5 different effects of the user s choice and only one of them can be made active There are 9 groups available and this...

Page 12: ...e to increase the selected value or anti clockwise to decrease The encoder works dynamically in other words the speed at which it is turned establishes the speed at which the selected value is varied...

Page 13: ...anging the memory patch To select a memory patch other than the one which is active Locate the flashing cursor on the memory patch indication using the CURSOR keys Turn the VALUE encoder until the req...

Page 14: ...LOCAL BYPASS status is different from the GENERAL BYPASS already discussed and will be described in the EDIT MODE section N B the level of a group in local bypass or OFF status can be modified but th...

Page 15: ...he patches In EDIT MODE the operator can carry out all the procedures relating to modification of the parameters connected to the programming of a patch The procedure for saving a new or modified patc...

Page 16: ...play passing through the hierarchical structure in the opposite direction to that explained for the EDIT key EFFECT EDIT PAGE EXIT GROUP EDIT PAGE EXIT MAIN EDIT PAGE EXIT MAIN MENU PAGE Enter Write k...

Page 17: ...e the GM 400 correctly The LOCAL BYPASS function cuts out one group e g DISTORTION EQ or MODULATION while the GENERAL BYPASS disables the entire chain of effects simultaneously It must be underlined t...

Page 18: ...ications made become operational immediately but will not become permanent until a memorization procedure described in point 5 3 MEMORIZING A PATCH of this same section has been carried out Otherwise...

Page 19: ...BANK and location LOC use the CURSOR keys and the VALUE encoder To change the NAME press the flashing UTILITY key to display then select the character to be modified using the CURSOR keys and change i...

Page 20: ...take care to make proper use of the BYPASS and COMPARE keys previously described in the EDIT MODE section The following is an example of a group edit page As stated in the introductory notes only one...

Page 21: ...iter and Dynamic Processor COMPRESSOR The Compressor modifies the dynamics of a sound by compressing it The volume of the quieter passages is increased while that of the louder passages is reduced The...

Page 22: ...ts name implies the limiter limits the dynamics of the signal to a value which can be freely set by the user Threshold parameter Range 0 45 Sets the value of the level of the input signal above which...

Page 23: ...Compresses the frequencies selected in the crossover without attenuation recovery Spectral Exp Gate Expands the frequencies selected in the crossover Eq Expander The combination of the equalizer and t...

Page 24: ...is is absolutely the best known guitar effect It simulates the distortion of an amplifier which has been saturated so that it emits a hard piercing sound It is often used for soloists Type parameter R...

Page 25: ...eter Range 4K0 3K2 2K5 2K0 1K6 Displays the cut off frequency used by a filter which eliminates all the frequencies above the one set Level parameter Range 0 100 Regulates the level of the output sign...

Page 26: ...Q 10 BANDS GRAPHIC EQ This is a 10 band graphic equalizer Since the frequencies at which it intervenes are preset the controls relate to the degree of attenuation and enhancement between 14dB and 14dB...

Page 27: ...Level parameter Range 0 100 Regulates the level of the output signal in the context of the effects chain PARAMETRIC EQ This is a parametric equalizer meaning an equalizer in which the user is able to...

Page 28: ...0 400 500 560 800 1k1 1k6 Hz Bandwidth Q Range 0 5 1 2 3 Enhancement Attenuation Range 14db 14dB This is a peaking filter which operates on the medium low frequencies capable of enhancing or attenuati...

Page 29: ...dence of the device on the overall sound quality Amp Type parameter Range DI V S HV This parameter is used to set the type of amplifier to be simulated The values this field is able to assume are 1 DI...

Page 30: ...fier to be simulated The values this field is able to assume are 1 DI BOX DI BOX linear response simulation 2 VALVE Simulation of a valve amplifier 3 SOLID STATE Simulation of a transistor amplifier 4...

Page 31: ...s obtained by subdividing the signal into two lines one remains unchanged while the tuning of the other is modified slightly in a cyclical way modulation The two lines are then mixed and the resulting...

Page 32: ...EVEL parameters FLANGER The Flanger effect is basically the same as the Chorus but a feedback of the signal to the input is added The effect obtained is often compared to the sound emitted by a jet du...

Page 33: ...s effect works like the Chorus and Flanger but instead of adding a modulated line to the direct sound it offers the addition of a line with slightly staggered timing In other words it reconstructs the...

Page 34: ...fect produces a periodic variation of volume at regular intervals with adjustment of the modulation speed and intensity Threshold parameter Range 0 100 Sets the level of the input signal above which t...

Page 35: ...rameter Range 0 100 Regulates the level of the output signal in the context of the effects chain VIBRATO The effect works in a similar way to the Tremolo but instead of affecting the volume it acts on...

Page 36: ...imulates the well known effect which sounds exactly like its name It is obtained by means of a filter which is opened and closed automatically by the level of the signal itself or by means of a remote...

Page 37: ...output signal in the context of the effects chain DBL COMB This is a comb filter with two lines which provide two resonance frequency patterns It is the equivalent of a flanger with its modulation lo...

Page 38: ...t it has two different modulants the sum of which gives less regular repetition patterns The two modulants may have different frequencies and depths Rate 1 and Rate 2 parameters Range 0 100 Sets the f...

Page 39: ...sound It is often used by guitarists to create a sound similar to that produced by a violin Time parameter Range 0 100 Regulates the effect opening time Threshold parameter Range 0 100 Sets the signa...

Page 40: ...frequency variation required subdivided into a roughly accurate part set in semitones Shift and a fine part set in hundredths of a tone Fine Delay parameter Range 0 100 This parameter sets the effect...

Page 41: ...modified Level parameter Range 0 100 Regulates the level of the individual shifting lines Mode parameter Range 1 5 Offers the user a choice of five operating modes Number 1 will provide operation of t...

Page 42: ...4 Selects which of the 4 lines is to be modified Depth parameter Range 0 100 This parameter regulates the modulation depth for each voice selected Level parameter Range 0 100 Regulates the level of th...

Page 43: ...ne 20K 19K 18K 17K 16K 14K5 12K5 11K5 10K 9K 8K 6K35 5K05 4K 2K 1K Displays the cut off frequency of a filter which eliminates all the frequencies higher than the one set Feedback parameter Range 0 10...

Page 44: ...is returned to its previous status Control of the TAP pedal When the Standard Delay effect is present the TAP pedal is also active It is used to enter the Time i e delay time of this delay not by edi...

Page 45: ...e 0 100 Regulates the level of the output signal in the context of the effects chain in this case the sum of the processed sound and the direct sound mixed by means of the LEVEL parameter of the 1st e...

Page 46: ...he selected tap Tap parameter Range 1 4 Allows the user to select the tap to be modified Pan parameter Range L 0 100 L 100 0 Determines the distribution of the selected tap within the stereo front Fee...

Page 47: ...d to the Standard Delay MULTI DELAY In this effect the delay line has been subdivided into 4 parts thus creating 4 absolutely independent delays which operate in parallel each with its own parameters...

Page 48: ...sound and the direct sound mixed by means of the LEVEL parameter of the 1st editing page of the effect and the DIRECT LEVEL parameter Control of the HOLD pedal The mechanism has already been explained...

Page 49: ...ase they are assumed always to be crotchets The parameter is used to set the delay time on the basis of the metronome speed of the song Pan parameter Range L 0 100 L 100 0 Determines the distribution...

Page 50: ...h it is constructed and the objects it contains and the position of the listener We will look at this concept in greater depth by analyzing the 3 main components of natural sound together Direct sound...

Page 51: ...reverb delay time Rev Time parameter Range 0 1 10 0 second with step of 0 1 secs Controls the duration of the reverb from 0 to 10 seconds Hi Damp parameter Range None 20K 19K 18K 17K 16K 14K5 12K5 11K...

Page 52: ...se controls act on equalization of the late reflections reverberation Effect Level parameter Range 0 100 This parameter regulates the quantity of the effect Direct parameter Range 0 100 Regulates the...

Page 53: ...s parameter sets the effect delay Rev Time parameter Range 50 500 ms Controls the duration of the reverb Density parameter Range 0 10 Controls the density of the sound reflections Envelope Shape param...

Page 54: ...midF parameters Frequency Range 100 140 200 280 400 560 800 1ko 1k4 2k0 2k8 4k0 5k6 8k0 Hz Bandwidth Q Range 0 5 1 2 3 Boost Cut Range 14db 14dB Early Reflections Eq Hi Shelve hshF parameters Frequenc...

Page 55: ...4 2k0 2k8 4k0 5k6 8k0 Hz Bandwidth Q Range 0 5 1 2 3 Boost Cut Range 14db 14dB Direct Eq Hi Shelve parameters Frequency range 1k5 2k1 3k0 4k2 6k0 8k5 12k Hz Boost Cut Range 14db 14dB For this section...

Page 56: ...ocessors used only by large recording studios Chamber Width parameter Range 1 40 metres Chamber Depth parameter Range 1 40 metres Chamber Height parameter Range 1 20 metres They set the dimensions in...

Page 57: ...tension of the spread Listener Shooting parameter Range 0 360 Step 5 They regulate the listening pick up angle The last three parameters set the virtual polar diagrams of the listening points The two...

Page 58: ...put parallel to the effect Hi Damp parameter Range None 20K 19K 18K 17K 16K 14K5 12K5 11K5 10K 9K 8K 6K35 5K05 4K 2K 1K Displays the cut off frequency of a filter which eliminates all the frequencies...

Page 59: ...ckground noises generated by the preamplification effects such as compressors and distorters or the hiss caused by very intensive equalization on the high frequencies By its very nature the Noise Gate...

Page 60: ...ill not have any effect 6 11 THE MIDI FOOT CONTROLLER PAGE This function can be used to set the parameters relating to use of the two optional pedal units which can be connected to the optional Oberhe...

Page 61: ...cond reversed or negative effects curves can be obtained Here again the range of values depends on the parameter selected N B a midi control change can also be assigned to each pedal 7 UTILITY MODE Th...

Page 62: ...program change messages in the standard way or by means of the mapping which can be defined by the user described in the PROGRAM TABLE section Fc1 and Fc2 parameters Range Y N Y yes N no Sets whether...

Page 63: ...ance in real time in a way similar to the procedure used for the analogue synthesizers without memory in use in the Seventies However in this case the changes are made automatically without interferin...

Page 64: ...the user to set the number of the Program Change to be used Location Bank parameter Range A B C Allows the user to select the Bank with the memory location to be associated to the Program Change Locat...

Page 65: ...the message on the LCD indicates once the parameters required have been selected and the correct Midi connections have been made the user simply starts the operation by pressing ENTER WRITE N B the d...

Page 66: ...diagram above shows a perfectly tuned C4 ripieno O marked by the two square brackets send a sound to the GM 400 and adjust the instrument s tuning until it is perfect A4 parameter Range 435 445 Allows...

Page 67: ...f the system becomes blocked or in case of accidental loss of data PANIC The basic values of a number of parameters of the control software will be restored if the contents of the memory have been con...

Page 68: ...iation of Digital Signal Processor Edit function for modification of the device parameters Foot Controller type of pedal control unit Allows commands to be given to the device while playing is in prog...

Page 69: ...ORY 192K WORDS 107 2 S STATIC DELAY MEMORY 768 WORDS 18 75 MS DATA ALU PROCESSING 1 4 MIPS ADDRESS ALU PROCESSING 1 6 MIPS MULTIPLIER SIZE 32 24 BITS MEMORY CAPACITY 3 BANKS X 128 PROGRAMS 384 TOTAL P...

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Page 71: ...0 127 VELOCITY Note ON Note OFF X X O X AFTER Key s TOUCH Ch s X X X X PITCH BENDER X X CONTROL 7 CHANGE 64 66 67 91 93 O O O O O O O O O O O O Volume Hold Sostenuto Soft Reverb Chorus PROGRAM CHANGE...

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Page 73: ...ating system since this version of the manual was completed The information contained in this version of the version of the owner s manual supercedes all previous version NOTE This equipment has been...

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