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Chapter 6 Filter eects 131
EVOC 20 TrackOscillator synthesis in parameters
The Synthesis In section controls various aspects of the tracking signal for the synthesizer. The
tracking signal is used to trigger the internal synthesizer.
Synthesis in parameters
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Synthesis In pop-up menu: Choose the tracking signal source:
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Track: Uses the input audio signal of the channel strip that EVOC 20 TrackOscillator is
inserted into as the synthesis signal, which drives the internal synthesizer.
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SideCh (SideChain): Uses a side chain as the synthesis signal. You choose the side-chain
source channel from the Side Chain pop-up menu in the upper-right corner of the EVOC 20
TrackOscillator window.
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Osc. (Oscillator): Sets the tracking oscillator as the synthesis source. The oscillator mirrors, or
tracks, the pitch of the analysis input signal. Choosing Osc activates the other parameters in
the synthesis section. If Osc is not chosen, the FM Ratio, FM Int, and other parameters in this
section have no eect.
Note: If you choose Side Chain and no Side Chain channel is assigned, EVOC 20 TrackOscillator
reverts to Track mode.
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Bands eld: Drag to set the number of frequency bands analyzed and then used by the
synthesis engine.
EVOC 20 TrackOscillator oscillators
Tracking oscillator parameters
The tracking oscillator follows the pitch of incoming monophonic audio signals and mirrors
these pitches with a synthesized sound. The FM tone generator for the tracking oscillator consists
of two oscillators, each of which generates a sine wave. The frequency of Oscillator 1, the carrier,
is modulated by Oscillator 2, the modulator, which deforms the sine wave of Oscillator 1. This
results in a waveform with rich harmonic content.
Important: The parameters discussed in this section are available only if the Synthesis In menu is
set to Osc. See EVOC 20 TrackOscillator synthesis in parameters.
Tracking oscillator parameters
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FM Ratio eld: Drag to set the ratio between Oscillators 1 and 2, which denes the basic
character of the sound. Even-numbered values or their multiples produce harmonic sounds,
whereas odd-numbered values or their multiples produce inharmonic, metallic sounds.
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An FM Ratio of 1.000 produces results resembling a sawtooth waveform.
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An FM Ratio of 2.000 produces results resembling a square wave with a pulse width of 50%.
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An FM Ratio of 3.000 produces results resembling a square wave with a pulse width of 33%.
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FM Int knob: Rotate to determine the intensity of modulation. Higher values result in a more
complex waveform with more overtones.