Adobe After Effects CS4 - Manual (Page 444)

438 USING AFTER EFFECTS CS4
Effects and animation presets
Last updated 12/21/2009
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.
Amplitude Modulation The amount of amplitude modulation.
More Help topics
“ Preview video and audio ” on page 195
Parametric EQ effect
The Parametric EQ effect emphasizes or attenuates specific frequency ranges. Parametric EQ is useful for enhancing
music, such as boosting low frequencies to bring up bass.
If you have audio with an unwanted sound (such as a beep from a forklift in the background), you can isolate and cut
the frequency range of the beep to attenuate the sound.
Using this effect, you can enhance up to three different bands of audio. As you adjust controls, a frequency-response
graph indicates the combined equalization curve you create; band 1 is red, band 2 is green, and band 3 is blue. You
may find it easier to specify controls if you determine in advance the frequency-response curve you want.
To identify the frequencies of unwanted sound, use the Audio Spectrum effect.
Band Enabled Activates an equalization band and its controls.
Frequency The center of the frequency band to modify.
Bandwidth The width of the frequency band to modify.
Boost/Cut The amount by which to boost (increase) or cut (decrease) the amplitude of the frequencies inside the
specified band. Positive values boost; negative values cut.
More Help topics
“ Audio Spectrum effect ” on page 488
“ Preview video and audio ” on page 195
Reverb effect
The Reverb effect simulates a spacious or acoustically live interior by simulating random reflections of a sound off a
surface.
Harry Frank and Aharon Rabinowitz provide a video tutorial on the All Bets Are Off website that shows how to use
the Backwards effect and the Reverb effect to create a creepy reverse echo result.
Reverb Time The average time, in milliseconds, between the original audio and the reverberated audio.
Diffusion Specifies how much the effect scatters the original audio. More diffusion can make the audio sound farther
from the microphone.
Decay Specifies the amount of time it takes for the effect to subside. A higher value simulates a larger space.