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4.2 The Edit View 23
4.2.1 The Oscillator Module
The Oscillator module is the main sound source of Ultra Analog VA and offers the features of
the most reputed analog oscillators. It provides a fine control on the pitch, standard waveforms,
a sub-oscillator, and hard synchronization. The Oscillator module is implemented using precise
modeling algorithms rather than wave tables providing alias free sources with clean pulse width
modulation and synchronization.
Waveform
The Shape drop down menu is used to choose the wave form generated by the oscillator. Wave
forms include sine wave, saw tooth, rectangular and white noise as shown in Figure 8.
When the Shape is set to rectangular, one has additional control and can adjust the pulse width
of the rectangular wave. This parameter is controlled using the PW knob. In its leftmost position
the pulse is very narrow while in its rightmost position the wave is perfectly square and only the
odd harmonics are heard. Note that the pulse width of the rectangular waveform can be modulated
with the signal received from the LFO module. The amount of modulation, around the value set
with the PW knob, can be set from the LFO module using the VCO PW knob.
Amplitude
Time
Amplitude
Time
Amplitude
Time
Time
Amplitude
sinus rectangular
saw tooth noise
Pulse Width
Figure 8: Choice of wave forms provided by the Oscillator module.
23


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