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Chapter 8 EVOC 20 PolySynth 151
EVOC 20 PolySynth modulation parameters
The Modulation section contains two LFOs that can either run freely or be synchronized with the
host application tempo.
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The Pitch LFO controls pitch modulation of the oscillators, enabling you to produce
vibrato eects.
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The Shift LFO controls the Formant Shift parameter of the synthesis lter bank, enabling you
to produce dynamic phasing-like eects.
Modulation parameters
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Int via Whl slider: Drag to set the intensity of LFO pitch modulation. The right half of the slider
determines the intensity when the modulation wheel is set to its maximum value; the left
half determines the intensity when the wheel is set to its minimum value. By dragging the
area between the two slider segments, you can simultaneously move both. This parameter
is permanently assigned to the modulation wheel of your MIDI keyboard, or corresponding
MIDI data.
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Rate knobs: Rotate to set the speed of modulation. Values to the left (of the centered position)
are synchronized with the host application tempo. These include bar values, triplet values, and
so on. Values to the right (of the centered position) are nonsynchronized, and are displayed in
Hertz—cycles per second.
Note: The ability to use synchronous bar values could be used to perform a formant shift
every four bars on a cycled one-bar percussion part, for example. Alternatively, you could
perform the same formant shift on every eighth-note triplet within the same part. Either
method can generate interesting results and lead to new ideas, or add life to existing
audio material.
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Waveform buttons: Click to set the waveform type used by the Pitch LFO (left column) or the
Shift LFO (right column). You can choose from the following waveforms for each LFO:
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Triangle
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Falling and rising sawtooth
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Square up and down around zero (bipolar, good for trills)
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Square up from zero (unipolar, good for changing between two denable pitches)
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Random stepped waveform (S & H)
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Smoothed random waveform
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Intensity slider: Drag to dene the amount of formant shift modulation by the Shift LFO.