Adobe After Effects CS3 - Manual (Page 380)

AFTER EFFECTS CS3
User Guide
375
Stereo Mixer effect
The Stereo Mixer effect mixes the left and right channels of audio and pans the entire signal from one channel to the
other.
Invert Phase Inverts the phase of both channels of the stereo signal. Use this control to prevent two sounds at the
same frequency from canceling each other out.
See also
“Preview video and audio” on page 120
Tone effect
The Tone effect synthesizes simple audio tones to create sounds, such as the low rumble of a submarine, a telephone
ringing in the background, sirens, or a laser blast. You can have up to five tones for each instance of the Tone effect,
to create a chord. When you apply this effect to a layer with audio, the dry (original, unprocessed) audio is ignored,
and only the tone plays.
You can also apply the Tone effect to a layer that has no audio, such as a solid layer, to synthesize audio.
Note: The Tone effect doesn’t generate audio on a placeholder layer; for the effect to generate audio, you must replace the
placeholder with a footage item.
Waveform Options Specifies the type of waveform to use. Sine waves produce the purest tones. Square waves
produce the most distorted tones. Triangle waves have elements of both sine waves and square waves but are closer
to sine waves. Saw waves have elements of both sine waves and square waves but are closer to square waves.
Frequency Frequency in Hz. To turn off a tone, set its frequency to 0.0.
Level Changes the amplitude of all tones in this instance of the effect. To avoid clipping and popping, use a Level
value that is no greater than 100 divided by the number of frequencies you use. For example, if you use all five
frequencies, specify 20%.
Note: To avoid clicks at the end of a tone, set a keyframe for the desired Level value at the frame just before the end of
the tone, and then set a keyframe for a Level value of 0.0 at the end of the tone. This technique works well for any audio
that you end abruptly.
See also
“Preview video and audio” on page 120
“Set keyframes” on page 187
Blur & Sharpen effects
About Blur & Sharpen effects
In general, blur effects sample the area around a pixel and assign to the pixel a new value that is the average of the
sampled values. Increased blurriness is the result of increasing the size of the sample, whether this is expressed as a
radius or a length.