Apple Logic Express 7 - Manual (Page 290)

290 Chapter 11 Sample Editor
Reverse
Functions > Reverse reverses the selected audio passage.
Trim
Functions > Trim erases all Regions that aren’t selected. Use it to remove unimportant
passages from the start and end of your audio files.
Make sure that the areas you are about to delete do not contain any Regions that you
may need. Regions outside the selection will be lost, and Regions that fall partly
outside will be shortened. If any such Regions are being used in the Arrange, an alert
box appears, giving you the option to cancel the trim function.
Remove DC Offset
Poorly constructed audio hardware can result in direct current (DC) being layered over
the audio signal. This results in a vertical shift in the waveform position, which can be
clearly seen in the Sample Editor.
During playback, this can cause crackling sounds at the start and end of the audio
Region.
Functions > Remove DC Offset centers the waveform around the zero amplitude line, to
avoid crackling at cut points.
Search Peak/Silence
Search Peak
Functions > Search Peak scans the currently selected Region for the sample bit with the
greatest amplitude value. The cursor in the waveform display is then placed on this bit.
Search Silence
Functions > Search Silence scans the selected audio for sections containing silence
(“digital zero”). The cursor is then placed at the start of the first section found, that fits
this description.
Adjust Tempo…
Just like Automatic Tempo Matching in the Arrange, the Adjust Tempo by Selection &
Locators function adjusts the song tempo, according to the current locator positions
and Sample Edit window selection.
The operation is similar to the Arrange function; it only refers to the selection in the
Sample Edit window, rather than the overall Region length.