Oberheim Two Voice Скачать руководство пользователя страница 5

 

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The third switch allows either KEYBOARD VOLTAGE ONE or KEYBOARD 
VOLTAGE TWO to be added, respectively, to either SEQUENCE OUT-
PUT ONE or SEQUENCER OUTPUT TWO. Thus one of the keyboard volt-
age outputs may be used to transpose a sequence from one note 
to another without affecting the pitches produced by the other 
voltage in controlling the other voice module.

3. The SEQUENCE LENGTH switch is used to shorten a full eight-
step sequence down to anywhere from seven steps to only one. 
When this switch, for example, is set to "7", the sequencer 
will count through positions 1-7 and then skip the 8th step, 
starting over instead from position 1. This is useful in set-
ting odd or asymmetrical rhythms.

4. The two rotary pots in this section of the panel determine 
respectively the RANGE covered by the sample/hold output vol-
tage, and the amount 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 PORTAMENTO control 
produces on pitches being governed by the keyboard.

5. This is the MASTER CLOCK that steps the sequencer and oper-
ates the sample/hold. The rotary knob determines the frequency 
of this clock--i.e. the stepping rate or tempo. The three-posi-
tion switch turns the clock on and off; it can also be clicked 
momentarily down to advance the sequencer one step or to cause 
a new sample voltage to be taken.

A switch is incorporated into the clock tempo control, allowing 
the knob to be pulled out from the panel. In this position, the 
clock rate will be controlled by SEQUENCER OUTPUT TWO. This 
voltage control of the clock frequency is also affected by the 
third VOLTAGE ASSIGNMENT SWITCH: in its uppermost position (#2 
above), the keyboard voltage is added to sequencer output two 
and will therefore also determine the clock rate.

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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