TC-Helicon VoicePro - Manual (Page 61)

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Section 6: Detailed Parameter Descriptions
The Scoop Duration parameters set how long these
inflections last after a note starts. The Rand. Parameter
determines how often they occur. CHARACTER | Vibrato
The Vibrato effect models the sound of human vibratos
onto the input voice. The waveforms that control the vibrato
are modeled from real singers.
Style
A Vibrato Style sets all the Vibrato Parameters to a preset
sound. The Styles are authored with the amount at "Unity".
A Style can be very dependent on the input voice. The
name of the style will give you an indication of what the
Style will do.
Amount
Amount allows you to get more or less of a Style. With a
value of "Unity", all the Vibrato Parameters represent their
actual values. Above or below unity, the parameters are
scaled to achieve more or less of the sound.
Attack/Depth/Sustain/Release
Just like a synthesizer, the Vibrato style can be shaped
with Attack, Depth, Sustain and Release Parameters.
Attack will determine speed at which the Vibrato gets to its
target amount. Depth will modify the amount of vibrato in
each cycle. Sustain determines how long the vibrato will
stay active. Release sets the time it takes for the vibrato
effect to go off. It's important to note that vibrato is typically
triggered with note onsets.
Onset Delay
Sets the amount of time following a note onset it takes the
vibrato to reach its target amount.
Rate
Sets the speed at which the vibrato modulates.
Trem Amt/Phase
Vibrato also modifies level. The Trem Amt and Phase
parameters control how much the level fluctuates and its
phase relationship when compared to the pitch modulation.
Rand Mod.
Allows an overall randomization to be applied to the vibrato
style.