Adobe After Effects CS3 - Manual (Page 378)

AFTER EFFECTS CS3
User Guide
373
Stereo Voices Alternates assignment of voices to one of the two channels so that the first voice appears in the left
channel, the second in the right channel, the third in the left, and so on. To hear stereo voices, you must preview or
render in stereo.
Dry Out, Wet Out The amounts of the original (dry) sound and delayed (wet) sound in the final output. Values of
50% are commonly used.
See also
“Preview video and audio” on page 120
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.
Cutoff Frequency All frequencies below (High Pass) or above (Low Pass) are removed. If the unwanted sound
changes over time, animate this property.
To identify the frequencies of unwanted sound, use the Audio Spectrum effect.
Dry Out, Wet Out The amounts of the original (dry) sound and delayed (wet) sound in the final output. Common
values for removing frequencies are 0% for Dry Out and 100% for Wet Out.
See also
“Audio Spectrum effect” on page 421
“Preview video and audio” on page 120
Modulator effect
The Modulator effect adds both vibrato and tremolo to audio by modulating (varying) the frequency and amplitude.
Modulation Type The type of waveform to use. Sine produces smoother modulation. Triangle produces more abrupt
modulation.
Modulation Rate The rate in Hz of the modulation.
Modulation Depth The amount of frequency modulation.