Apple Logic Pro 7 User Manual Page 373

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Chapter 9 Audio Window 373
Using the Strip Silence Function
First, select the Region in the Audio window. If you are using split stereo audio files, the
corresponding Region of the other channel is automatically selected. Then select
Options > Strip Silence. The Strip Silence window will open. There is also an Arrange
window key command that allows you to open the Strip Silence window for a selected
Region.
The Strip Silence Window
There are several settings in the Strip Silence window that directly affect the number
and length of the newly created Regions. Every time you alter a parameter in the top
part of the window, the graphic display of the Region changes accordingly.
Strip Silence Parameters
Depending on the audio material, all parameters can have an effect on the number and
division of the Regions. You may need to experiment a little to obtain the desired
results.
Threshold
The Threshold defines the amplitude level that a passage must exceed, in order to be
defined as a Region. The units are shown in percentages.
In terms of the number and length of the Regions, this is the most important
parameter. As a general rule: a higher Threshold leads to more, short Regions.
Examples: low values (1) create large, continuous Regions, high values (2) create more,
short Regions
Min. time to accept as Silence
Min. time to accept as Silence defines the length of time that a section must be below
the threshold value, before it is considered a gap. The units are shown in seconds. The
smallest division is one tenth of a millisecond.
Very small values tend to increase the number of Regions, because even short dips in
amplitude are interpreted as silence. Higher values prevent sections of audio from
being “interrupted” by fluctuating amplitudes.
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