Adobe 65008009 - After Effects CS4 Using Manual page 443

Last updated 12/21/2009
The number of voices in the processed (wet) audio.
Voices
The rate in Hz at which the modulation cycles.
Modulation Rate
The amount of modulation.
Modulation Depth
The modulation phase difference in degrees between each subsequent voice. Divide 360 by the
Voice Phase Change
number of voices to find the optimum value.
Inverts the phase of the processed (wet) audio, emphasizing more of the high frequencies; not inverting
Invert Phase
the phase emphasizes more of the low frequencies.
Alternates assignment of voices to one of the two channels so that the first voice appears in the left
Stereo Voices
channel, the second in the right channel, the third in the left, and so on. To hear stereo voices, preview or render in
stereo.
The amounts of the original (dry) sound and delayed (wet) sound in the final output. Values of 50%
Dry Out, Wet Out
are commonly used.
More Help topics
"Preview video and audio" on page 195
High-Low Pass effect
The High-Low Pass effect sets a limit above or below which frequencies can pass. High Pass allows frequencies above
the limit and blocks frequencies below. Conversely, Low Pass allows frequencies below the limit and blocks frequencies
above. Use High-Low Pass to do the following:
• Enhance or attenuate (reduce) a sound. For example, using High Pass can reduce traffic noise, which often is
concentrated at low frequencies, while minimally affecting a voice recording. Using Low Pass can remove high-
frequency sounds, such as static and buzzing.
• Change the focus from one sound to another over time. For example, in audio that contains both music and voice,
you can fade out the music while gradually bringing in the voice.
• Protect equipment from potentially damaging frequencies.
• Direct certain frequencies to specific equipment. For example, use Low Pass to isolate sounds intended for a
subwoofer.
To check the frequencies that you filter out, switch to the opposite Filter Options value and preview audio.
All frequencies below (High Pass) or above (Low Pass) are removed. If the unwanted sound changes
Cutoff Frequency
over time, animate this property.
To identify the frequencies of unwanted sound, use the Audio Spectrum effect.
The amounts of the original (dry) sound and delayed (wet) sound in the final output. Common
Dry Out, Wet Out
values for removing frequencies are 0% for Dry Out and 100% for Wet Out.
More Help topics
"Audio Spectrum effect" on page 488
"Preview video and audio" on page 195
USING AFTER EFFECTS CS4
Effects and animation presets
437