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The pitch is defined by the oscillator frequency. You can set the frequency with 3 controllers:
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The |Range] selector determines the fundamental frequency expressed in feet. 32' brings
the lowest audible frequencies; 2' brings the highest audible frequencies. The "LO"
setting lets you use the oscillator as a low frequency oscillator (LFO) to modulate other
parameters.
-
The [Fine] knob allows you to tune the oscillator more precisely. This can be used to
create detuning effects.
-
The [Coarse] knob adjusts the frequency of the oscillator in semi-tones. This knob ranges
from minus 2, to 2 octaves above the fundamental frequency.
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The waveforms define the sonic characteristic of the oscillators sound. The wavetable oscillator
is based on the Prophet VS oscillator circuit. It uses digital waveforms sampled from diverse
sources: acoustic instruments, voice, and assorted sound effects. These waveforms give you
access to a sound palette much greater than that of most analog synthesizers.
-
The [Table] selection box selects one of the 96 wavetables included in the oscillator.
•
-
[FM]: The FM modulation allows you to modulate the frequency of the oscillator. You can
connect for example an LFO for vibrato effects, or use another oscillator for FM sounds.
This can yield interesting results for inharmonic sonorities like bell sounds, but it can also
be quickly distorted if you introduce a square or sawtooth signal.
-
[AM]: This input allows you to modulate the level of the audio output of the oscillator.
You can use for example a LFO to create tremolo effects or an envelope to control the
output level over time.
-
The Amount knobs allow you to set the depth of the selected modulation.
-
The Bipolar or Unipolar selector allows you to set the polarity of the selected modulation.
•
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[Audio]: This is the audio output of the oscillator. You can for example connect this
output to a mixer module to mix the oscillator signal with other audio modules.
Alternatively you can connect it directly to a filter or VCA module.
NOTE: The oscillator's parameters can also be controlled in real time with the dedicated hardware
knobs located in the [Oscillator] section. This section can be found at the top left of the front
panel interface.
9.1.1.2
Filters
The audio output signal generated by an oscillator is generally directed to a filter module or VCF
(Voltage Controlled Filter). It is this module that we use to control the sound by filtering
(attenuating) certain harmonics from the raw oscillator signal. It can be considered as a
sophisticated equalizer that attenuates, depending on the filter type, a range of frequencies
specified by the cutoff frequency. A low pass filter attenuates frequencies above the cutoff
frequency. High pass filter attenuate frequencies below the cutoff frequency. A band pass filter is a
combination of a high pass and low pass filter, attenuating frequencies above and below the cutoff
frequency. The notch filter is the inverse of a band pass filter; it attenuates frequencies around the
cutoff frequency.
The removal of frequencies is not absolute but progressive, and depends on the filtering slope. This
filtering slope is expressed in decibels per octave (or dB/Oct). For example a 12dB/Oct low pass
filter attenuates frequencies one octave above the cutoff frequency with 12dB, two octaves above
the cutoff frequency with 24dB etc. Most filters used in classic analog synthesizers have 24 dB/Oct
or 12 dB/Oct slopes. The filter slope can also be expressed in poles; you can calculate the slope in
ARTURIA – ORIGIN – USER'S MANUAL
The Pitch:
The waveforms:
The Input connections:
The Output connections:
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