Oberheim OB 12 Operating Manual - page 50
OB 12
Z-Domain Synthesizer
170
•
SYNC STATUS
([SYNC])
: activates (SYNC STATUS=ON) and
deactivates (SYNC STATUS=OFF) the synchronisation of the
waveform leaving Osc.2 with that generated by Osc.1. This
means that whenever the Osc.1 waveform returns to its
starting point the Osc.2 waveform will also be reset (or
returned to its cycle start), thus obtaining a more complex
waveform.
•
PITCH KEYB. TRK.
(Pitch Keyboard Tracking, [KBD
TRACK] of the OSCILLATOR 2 section)
: activates (PITCH
KEYB. TRK.=YES) / deactivates (PITCH KEYB.
TRK.=NO) the T
racking function.
This function is widely used to control the filter, as
we will see later, and the oscillator. With the function
enabled, the oscillator pitch (and thus the signal it
generates) varies depending on which key is
pressed; in this case, each key corresponds to one
note. When this function is disabled the frequency
of the signal generated by Osc.2 will no longer
depend on the key pressed but on the FIXED PITCH
CRS and FIXED PITCH FINE parameters, which
specify its pitch.
•
PITCH SHIFT RNG
(
Pitch Shift Range, [RANGE])
: this option allows the pitch to be set in a range
of +/-24 semitones, so that the pitch of the second oscillator is varied in relation to the first.
The resulting waveform (in the OSC.COMMON suction) will be even more complex, as the
signal is more “spacious” and richer in unharmonic and harmonic partials.
•
PITCH SHIFT FINE
(
Pitch Shift Fine, [FINE])
: regulates the fine tuning of the second oscillator in
a range of +/- 1/2 semitone.
If the
Tracking is disabled, the display shows the following fields:
in which we can see that the PITCH SHIFT RNG and PITCH SHIFT FINE parameters have been
replaced by:
•
FIXED PITCH CRS
(Fixed Pitch Course, [RANGE])
: sets the frequency of the signal generated by
the second oscillator, and thus its fixed pitch.
•
FIXED PITCH FINE
(Fixed Pitch Fine, [FINE])
: provides fine tuning of the fixed pitch of the signal
leaving the second oscillator