Adobe AUDITION 3 User Manual page 121

Helps to handle sharp spikes that might occur at the onset of a louder signal and go beyond the
Lookahead Time
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: The spikes occur because it takes a little time to determine and react to the current signal level (that is, to determine
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.
Completely silences signals that fall below the specified threshold.
Noise Gating
Band Limiting options
Click Band Limiting to limit dynamics manipulation to a specified range.
Is the lowest frequency that dynamics processing will affect. You can define a band, or range, to which
Low Cutoff
compression or expansion is applied within the current frequency range.
Is the highest frequency that dynamics processing will affect. To use the entire frequency range of the
High Cutoff
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).
Though the Envelope effect isn't available in Multitrack View, you can use automation lanes to accomplish the same
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
ADOBE AUDITION 3.0 116
User Guide