Oberheim OB 12, Руководство по эксплуатации

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OB 12 Z-Domain Synthesizer
8.3 EDIT OSCILLATOR COMMON
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As we have already described, the waveform leaving the two oscillators is the sum of three basic
waveforms, and is therefore a complex waveform. The OSC.COMMON section mixes the two
waveforms to create the most widely varying combinations. As well as this, the resulting waveform
can be combined with the result of the mixing of Osc.1 with Osc.2 with a Ring Modulator and
white noise.
THE RING MODULATOR
This function modulates (or more technically multiplies) two signals, in our case the one from the
first oscillator with the one generated by the second oscillator, with a
ring modulation technique.
The resulting sound features a large number of harmonic and unharmonic partials not present in
the harmonic spectrum of the original signals, making it more metallic, dissonant and almost out
of tune.
WHITE NOISE
When creating a timbre, it is sometimes necessary to bear in
mind noises present in the original sounds, or unharmonic
elements. This is done using white noise generators. White
noise is a wide-band non-periodic signal containing all the
frequencies in the audible band, which you can use to add a
slight hiss to the original signal.
In addition, this section of the generation chain allows
you to define the envelope which will control the two
oscillators. The envelope concerned will specify how
the frequency of the signals generated by Osc.1 and
Osc.2 will vary over time, or in other words how the pitch
of the sound will vary over time.
For further information about the envelopes, refer to point 8.4.
From the EDIT TIMBRE MENU, select point 2-OSC.COMMON; the display will show the first
page of the section concerned:
in which you can set the three mixing functions described at the start of this section using the
following parameters:
•
BALANCE1
([BALANCE], OSC.1
ð
OSC.2slider)
: regulates the balancing of the signals obtained
from Osc.1 and Osc.2 in a range between 0 (Osc.1 signal only) and 100 (Osc.2 signal only).
Intermediate values will give intermediate balances between the two signals.