User`s manual

Page 14
Voyager OS User’s Manual - The Components
Page 15
Voyager OS User’s Manual - The Components
B. The Oscillator Section
The Oscillators are the main sound source of the Voyager. The oscillators in the Voyager are all analog
Voltage Controlled Oscillators, or VCOs. They feature a temperature regulation circuit that provides them
with excellent tuning stability. The VCOs can produce a total musical range of 8  octaves! In addition, the
frequency of oscillator 3 can be set to the sub-audio range (<20Hz) for use as a second LFO.
Oscillator 1 performs as a master oscillator to which
Oscillator 2 and 3 are tuned. The timbres of the oscillators
are adjusted by their variable Waveform controls. In addition,
there are switches for Oscillator 2 sync to Oscillator 1;
linear frequency modulation of Oscillator 1 by Oscillator 3;
Oscillator 3 keyboard control ON/OFF; and Oscillator 3 Lo
or Hi frequency range.
The frequencies of the Oscillators are controlled by a number
of sources. The main source is the pitch CV generated
by keyboard. A glide circuit can be switched in between
the Keyboard CV and the oscillators to slow the changes
between notes, producing glissando. The Keyboard CV is
internally mixed with the Octave switch CV, the Frequency
control (Oscillators 2 and 3), the Pitch Bend Wheel, the Fine
Tune control, and the output of the Mod Busses when the
‘Pitch’ destination is selected.
Oscillator Section Controls:
Octave:
Each Oscillator has a 6-position
OCTAVE
switch that selects the relative frequency range. To hear how it
works, turn off Oscillators 2 and 3 in the Mixer. Switch Oscillator 1 ON and set its level to 5. Play a note
on the keyboard and rotate the Oscillator 1 octave switch clockwise one click – the note will rise an octave.
You can use this control to change the frequency range that the keyboard controls. The panel markings
from 32’ up to 1’ are octave standards based on organ stops.
Frequency:
Oscillators 2 and 3 have a
FREQUENCY
control. When the control is in the center position, the oscillators
should be in unison with the frequency of Oscillator 1 (when the octave switches for all three oscillators
are in the same position). The Frequency control can change the pitch of Oscillator 2 or 3 a total of +/- 7
semitones relative to Oscillator 1. This allows more than one frequency to be played when a key is pressed,
or to get a swirly chorus sound when the oscillators are slightly out of tune.
NOTE: The Oscillator FREQUENCY controls have no calibration - sometimes unison tunings
are made with the controls a little left or right of center. Oscillator 1 does not have a Frequency
control because it is designed to serve as a reference oscillator for the other 2 oscillators.