TC-Helicon VoicePro - Manual (Page 56)

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Section 6: Detailed Parameter Descriptions
PITCH | Mode
The pitch block in VoicePro has several modes. The
visualization for the pitch block changes based on the
mode. This tab also contains parameters that adjust the
sound of the pitch shifting.
Modeling Optimization
To support legacy type pitch shifting, modeling optimization
can be turned off. In this state, transitions can be heard
when turning off various Character blocks. However, in this
state the legacy pitch shift sounds used for effects like
monster pitch shifts can be produced. It can also be useful
to turn modeling optimization off when doing small pitch
shifts in, for example, pitch correction applications.
Formant Correct Amount
Formants affect the naturalness of a pitch shift. In VoicePro
formants and pitch can be shifted separately. The Formant
Correction Amt control sets the amount the formants are
corrected/shifted. When set to "0", formants are shifted with
the pitch like an instrument shifter. When set to "100", the
formants are not shifted like a PSOLA shifter. When set to
Auto, the amount of formant correction is modified as a
function of shift amount to sound the most natural.
Formant Offset
The overall formant structure of the voice can be shifted up
to sound more feminine and even chipmunk like at extreme
settings. Formants can be shifted down to sound more
masculine or monster like. This control moves the
formants independent of the pitch shift.
Un-Shift Atten
This parameter allows the un-voiced (sibilant) signals to be
attenuated when pitch shifting. The effect is more
noticeable the larger the shift.
UV Shift Amount
This parameter determines the amount that the unvoiced is
shifted relative to the voiced signal. When this parameter
is set to "100" the algorithm shifts unvoiced signals by the
same amount as the voiced signals. When this parameter
is "0", the algorithm will not shift the unvoiced sections
regardless of the amount the voiced signal is being shifted.
Intermediate values of this parameter will shift the unvoiced
by a fraction of what the voiced signal is being shifted.
When this parameter is set to "auto" the UV shift amount is
set automatically for you.
Downshift Quality
This parameter can adjust the tonal quality of large down
shifts. The effect of the parameters becomes more
apparent for large down shifts.