Apple Logic (1.1) - Manual (Page 60)

60 Chapter 6 Audio Regions
Below the waveform display, you can see three markers that can be dragged with the
mouse.
These are:
The S arrow pointing to the right indicates the start point of the Audio Region. If you
move it from, say, the kick drum at the beginning of the drum loop to a snare beat, the
loop will start with the snare when the arrangement is played back. When you move
the S marker, you will also move the upwards-pointing black triangle. You can also grab
the triangle directly, and move it separately.
The black triangle represents the Anchor point of the Audio Region. If it isn’t placed at
the same position as the S marker, the Region will be positioned (snapped) in
accordance with the triangle when moved in the Arrange window—rather than the
position of the S marker.
You can, for example, place the triangle at the downbeat of a recording, but also
include an upbeat by shifting the S marker to the left. If you move the Audio Region in
the Arrange window, its position will snap according to the downbeat, rather than the
beginning of the upbeat. This facility makes accurate Region placement much easier.
Note: The Anchor point can not be positioned before or after the Sample Start and End
points, respectively.