10.6

141Logic Pro Effects
A short introduction to formants
A formant is a peak in the frequency spectrum of a sound. In the context of human voices,
formants are the key component that enables humans to distinguish between different
vowel sounds—based purely on the frequency of the sounds. Formants in human speech
and singing are produced by the vocal tract, with most vowel sounds containing four or
more formants.
U/V detection parameters
• Sensitivity knob: Determine how responsive U/V detection is. Turn to the right for
higher settings, where more of the individual unvoiced portions of the input signal
are recognized. When high settings are used, the increased sensitivity to unvoiced
signals can lead to the U/V sound source being used on the majority of the input
signal, including voiced signals. Sonically, this results in a sound that resembles a
radio signal that is breaking up and contains a lot of static, or noise. (The U/V sound
source is determined by the Mode menu, as described below.)
• Mode pop-up menu: Choose the sound sources used to replace the unvoiced content of
the input signal.
• Noise: Uses noise alone for the unvoiced portions of the sound.
• N + Syn (Noise + Synthesizer): Uses noise and the synthesizer for the unvoiced
portions of the sound.
• Blend: Uses the analysis signal after it has passed through a highpass filter for the
unvoiced portions of the sound. The Sensitivity parameter has no effect when this
setting is used.
• Level knob: Set the volume of the signal used to replace the unvoiced content of the
input signal.
Important: Be careful with the Level knob, particularly when using a high Sensitivity
value, to avoid internally overloading the EVOC 20 TrackOscillator.