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Table Of Contents
Chapter 14 EVOC 20 PolySynth 163
Resonance
Resonance is responsible for the basic sonic character of the vocoder: low settings give
it a soft character, high settings will lead to a more snarling, sharp character. Increasing
the Resonance value emphasizes the middle frequency of each frequency band.
Note: The use of either, or both, of the Formant Stretch and Formant Shift parameters
can result in the generation of unusual resonant frequencies—when high Resonance
settings are used.
Modulation Parameters
The Modulation section offers two LFOs to control the Formant Shift and Pitch
parameters of the EVOC 20 PolySynth. The LFOs can run free or synchronized to the
projects tempo.
 Pitch LFO: Controls Pitch modulation (Vibrato) of the built-in synthesizer’s oscillators.
It is hardwired to accept data from the modulation wheel of your MIDI keyboard (or
corresponding MIDI data) to control modulation intensity.
 Shift LFO: Controls the Formant Shift parameter of the synthesis filter bank to
produce dynamic phasing-like effects.
Wave Buttons
These buttons in this section allow you to select the waveform type used by Pitch LFO
and Shift LFO. A selection of Triangle, falling and rising Sawtooth, Square up and down
around zero (bipolar, good for trills), Square up from zero (unipolar, good for changing
between two definable pitches), a random stepped waveform (S&H), and a smoothed
random waveform is available for each LFO.