40
The Editor View
this sub-oscillator signal in the output signal of the oscillator is adjusted with the
Sub
knob. When
this knob is fully turned to the left, the sub-oscillator is muted. Note that when the oscillator is
used in its
Sync
mode (see section 5.3.1 below), the sub-oscillator becomes unavailable.
Synchronization
The
Oscillator
module features a hard synchronization mode which is toggled
on
or
off
with the
help of the
Hard Sync
button. Synchronization involves a master and a slave oscillator. In this
mode, the signal from the slave
Oscillator
is reset, or in other words restarted, at the beginning
of each period of the waveform of the master oscillator which therefore acts as a master clock as
shown in Figure 21.
The perceived pitch of the final output of the oscillator module is the same as that of the master
oscillator while the frequency of the slave or synced oscillator only affects the harmonic content
and therefore the timbre of the resulting signal. The
Shape
control applies to the shape of the
slave oscillator. The shape of the oscillation of the master is indeed irrelevant as it is only used to
generate a master clock signal.
In hard sync mode, the frequency of the master oscillator is determined by the settings of the
Octave
,
Semi
and
Key
controls. The frequency of the slave oscillator is adjusted using the
Tune
knob and its value is presented as a ratio between the frequency of the slave and that of the master
oscillator. It can take values between 1 and 20 and can be modulated by the ramp signal of the
oscillator envelope using the
Ramp
knob and the output from the
LFO
module.
Note that in sync mode, the sub-oscillator knob is not available.
5.3.2
The Filter Module
Ultra Analog VA-3
is equipped with two multi-mode filters. The filters are patched in a flexible
way in order to allow their use in parallel, in series or any combination of both. For even more
flexibility, the cutoff frequency of the
Filter 2
can also be locked to that of
Filter 1
.
Each of the multi-mode filters include a resonant low-pass, band-pass, high-pass, notch and
two formant filters which can be selected using the
Type
drop-down menu. The order of the filters
can be adjusted to 2 (-12 dB/oct for low-pass and high-pass and -6 db/oct for band-pass) or 4 (-
24 dB/oct for low-pass and high-pass and -12 db/oct for band-pass) with the help of the
Order
parameter. Furthermore different saturation algorithms, selected with the
Drive
drop-down menu,
can be applied to the filters. The resonance or cutoff frequency of the filters is adjusted with the
Frequency
knob while the amount of resonance is controlled with the
Resonance
knob. When a
formant filter is used, the
Resonance
knob is used to cycle between the vowels (a, e, i, o, u).
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