Oberheim Two Voice Скачать руководство пользователя страница 20

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the first voice to SEQ 1 control and set the 2ND VOICE 
switch OFF. Play the first note of the sequence on the 
keyboard; it will be produced from the second voice mod-
ule which is still under keyboard control. (If the 
sequencer is not at step one of the eight steps, use the 
manual STEP to get it there.) Use the control voltage 
preset to tune the first voice to unison with the pitch 
being produced from voice module two. Play the next note 
in the sequence, advance the sequence one step, and 
repeat the tuning procedure. Continue until the sequence 
is complete.

RULES OF THUMB FOR FILTER CONTROL

1. Suppose that the VCF frequency is at maximum.. It would 

make little sense to open the control attenuator in the 
positive direction, since that could only increase the 
frequency even further, so...

2. Imagine that the frequency knob and the attenuator knob 

are geared together so that as one is turned to the left 
the other must turn to the right. This will keep your 
settings in the most effective range.

3. As you increase the filter resonance beyond about the 

eleven o'clock position, begin to decrease the audio 
input levels to the filter, until at maximum resonance 
the audio input level(s) is(are) no further than about 
ten o'clock or two o'clock position.

GENERAL REMARKS

1. Remember that you do not always have to use the two 

voices separately. Complex and beautiful sounds can be 
produced in single-voice operation by combining the two 
modules, using complementary envelope settings on each 
one. For example, use a percussive envelope on one and a 
long-attack, "bowed" attack on the other. The two sounds 
will fade from one to the other.

2. You can also set them up as two contrasting voices and 

use the level controls on the output mixer to "switch" 
from one to the other. In other words, use them as "pre-
set" voices.

3. For the most flexible, expressive playing, in every patch 

try to identify two or three points at which you can make 
significant performing changes in the sound with a mini-
mum effort. For example, once you have a good "brass" 
envelope using a sawtooth wave, you will have a good 
clarinet for practical purposes simply by changing the 
input audio to a square wave.

Содержание Two Voice

Страница 1: ...A BRIEF INSTRUCTION MANUAL for the OBERHEIM TWO VOICE SYNTHESIZER prepared by james michmerhuizen director the boston school of electronic music...

Страница 2: ...is on voice module two will not be gated until a second key is depressed 3 The PORTAMENTO control normally left fully counterclock wise introduces a lengthening pitch slide between different notes on...

Страница 3: ...king the external connection to headphones or ampli fier you may turn the synthesizer on Locate the ASSIGNMENTS switches in the minisequencer section and be sure that they are all down In each voice m...

Страница 4: ...scription following applies to the three switch version The first switch on the left selects the source of control voltages and gates for VOICE MODULE ONE In its lowest posi tion voice module one will...

Страница 5: ...nt of LAG low frequency filtering applied to the sample hold voltage Turning the lag control to the right produces in other words the same effect on pitches being governed by the sample hold that the...

Страница 6: ...he three position switch selects one of three control signals indicated on the panel to be routed through the rotary pot just above the switch If this knob is rotated to the right the selected control...

Страница 7: ...ter begins to have some effect on a signal passing through it is called the cutoff frequency of the filter The large single knob labelled RESONANCE determines the filter resonance at its cutoff freque...

Страница 8: ...ctly to the output of the NOISE GENERATOR that is part of the sample hold in the minisequencer Noise filtered in various ways is used in the production of wind thunder and motor sounds as well as many...

Страница 9: ...e NOTE above In order to simplify the operation of the voice module while learning or whenever it is necessary to hear continuous sound this VCA BYPASS SWITCH can be moved to the on right position Thi...

Страница 10: ...nual pulse width controls of each oscillator note that these have no effect on the sawtooth oscillator outputs and finally with the VCF manual controls for frequency resonance and pass mode Do not at...

Страница 11: ...by voltage control you are changing the range or area of particular frequencies that are emphasized Try using maximum resonance with a lowpitched sawtooth input open only a little about 10 o clock an...

Страница 12: ...s the filter frequency down as it is rotated to the right the ENV 2 signal drives the filter frequency up d as the filter resonance is increased its output level will generally increase Compensate by...

Страница 13: ...nd sustain and fairly short decay Now slight changes in the filter frequency control in the range 12 o clock to 3 O clock will produce a wide range of percussive noises In a later section you will lea...

Страница 14: ...dinary and conservative results however will come from playing con tinuous legato on the lower voice and a slight nonlegato on the upper voice E TROUBLESHOOTING I Using only the controls we have intro...

Страница 15: ...t s how we started you off the VCA BYPASS switch on and the filter open If either of these conditions does not hold then no continuous sound is possible except that with certain envelope settings unde...

Страница 16: ...o change the pitch of the oscillator The on off switch for the minisequencer CLOCK has also a lower position labelled step This position is spring loaded and the svitcb will not stay there but every t...

Страница 17: ...nspositions will occur with the depression of only a single key if one key is held down while another is depressed to the right of it the sequence will transpose to the higher key only for as long as...

Страница 18: ...trol of the s h begin with the two knobs in the s h section rotated maximum counterclockvise and slowly increase the range setting The first voice produces a series of random pitches over a wider and...

Страница 19: ...all four to check 4 The beat frequency will always double as you go up by octaves So after you have tuned at 8 go up to 4 and then 2 to check on the tuning of each oscillator read just if necessary If...

Страница 20: ...fective range 3 As you increase the filter resonance beyond about the eleven o clock position begin to decrease the audio input levels to the filter until at maximum resonance the audio input level s...

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