Apple Logic Express 7 - Manual (Page 138)

138 Chapter 4 Audio in the Arrange Window
You can edit a Region’s start and endpoints far more accurately with the Sample Editor,
which can be opened by double-clicking on the Region. Simply slide the “S” and “E”
markers to change the Start and End points of the region. While moving the Start
point, use the Option-key, to ensure that the Anchor (and therefore the timing of the
audio, relative to the rest of the arrangement), remains unchanged. The Anchor must
be positioned inside the Region.
If you wish to move the start point to the right, first move it to the approximate target
position while in the Arrange window. Then open the Sample Editor, and use the
Option-key to precisely move the start point to the desired location.
Adjusting the Grid to Zero Crossings
If Edit > Search Zero Crossings is switched on in the Audio window, the adjustment will
snap to the nearest zero crossing point of the waveform every time you alter the start
or endpoint of a Region in the Arrange window. The Anchor is not affected.
The disadvantage of this option is that altered start or endpoints never land exactly on
the selected musical grid, and will always be a few ticks out. Normally, this won’t
matter, because the Anchor reference point is unaffected. Should this ever cause a
problem, you can simply switch off the Search Zero Crossings option. The primary
reason for activation of the zero crossings option, is that it prevents clicks and pops at
region start and endpoints.
Region Parameter Box
Name
As with MIDI Regions, the top line of the Region Parameter box displays, and allows
you to edit, the name of the Audio Region. You can name several selected Audio
Regions simultaneously; the Regions are assigned the same name, with sequential
numbers added to the end of the name. Logic inserts these numbers automatically,
unless you deliberately leave a space at the end of the name.
When you change the name of a Region in the Arrange, the corresponding Region is
also renamed in the Audio window.
Loop
As with MIDI Regions, you can use the Loop parameter to make a Region repeat
automatically. The loop repeats until it reaches the next Region on the track, the end of
the song, or the end of the folder that contains the Region.
Don’t forget that these loops are based on the Region’s sample grid. This means that
even if the Region is precisely matched to the song tempo, loop repeats may start to
go out of sync after a while. You can avoid this problem by setting the endpoint of the
Region to an exact measure boundary. In these cases, it may be better to use the
Region > Repeat Regions function (see “Copying Regions” on page 109).