Operation Manual

ADOBE AUDITION 3.0
User Guide
116
Lookahead Time Helps to handle sharp spikes that might occur at the onset of a louder signal and go beyond the
limits of the compressor settings. While this approach may be desirable to enhance the impact of drum hits, for
example, it isn’t desirable if you use limiting to reduce the maximum amplitude of audio.
Note: Thespikesoccurbecauseittakesalittletimetodetermineandreacttothecurrentsignallevel(thatis,todetermine
the Level Detector’s attack value and the Gain Processor’s attack value). Lookahead Time actually causes the attacks to
start before the audio gets loud instead of right on top of the transient. Otherwise, with a Lookahead Time of 0, a spike
stays loud until all of the attack times have elapsed.
Noise Gating Completely silences signals that fall below the specified threshold.
Band Limiting options
Click Band Limiting to limit dynamics manipulation to a specified range.
Low Cutoff Is the lowest frequency that dynamics processing will affect. You can define a band, or range, to which
compression or expansion is applied within the current frequency range.
High Cutoff Is the highest frequency that dynamics processing will affect. To use the entire frequency range of the
source material, enter half of the current sample rate. (See “Nyquist frequency” on page 277.)
To use the entire frequency range of the source material, set the Low Cutoff to 0 and the High Cutoff to 1/2 the current
sample rate (24,000 for 48 kHz, 11,025 for 22 kHz, and so on).
Envelope effect (Edit View only)
The Amplitude And Compression > Envelope effect lets you precisely control amplitude over time, enabling you to
combine a wide range of amplification effects, such as multiple fades and boosts. The top of the Envelope graph
represents 100% (normal) amplification; the bottom represents 100% attenuation (silence).
ThoughtheEnvelopeeffectisn’tavailableinMultitrackView,youcanuseautomationlanestoaccomplishthesame
task. (See “Automating track settings” on page 204.)
Envelope graph (Bell Curve preset)
See also
“About process effects” on page 104
“Apply individual effects in Edit View” on page 107
“Control effects settings with graphs” on page 104
“Use effect presets” on page 104
“Add preroll and postroll to effects previews” on page 107