Apple Logic Pro 9 - Manual (Page 367)

In cases where the zoom level is extremely low (macroscopic), and a fine Snap value (such
as Division or Frames) is chosen, normal mouse movements result in larger grid units. In
these situations, either alter the zoom level, or hold down the Control key to actually use
the chosen Snap value.
Using Control-Shift breaks the 1:1 relationship between the mouse and region (or edit
tool) movements. This means that you may need to move the mouse a long way
(horizontally) to make the region (or edit tool) move one pixel. Watch the help tag for
exact numerical readouts.
Imagine you want to shorten a region in a 4/4 bar so that the 4 is played, but not the “4
and” of the last bar.
To shorten a region by one division value when Snap is set to Beat
1 Horizontally zoom the screen display until you can see quarter notes in the Bar ruler.
2 Grab the bottom-right corner of a region, and move the mouse to the left, until the region
is shortened by one quarter note.
3 Press the Control key, and move the mouse carefully to the right, until the region becomes
one division longer.
While you’re doing this, the help tag shows the region start position, track number, and
the current length of the region in bars, beats, divisions, and ticks. The three numbers to
the right should be 3 1 0.
Using Drag Modes
Logic Pro provides several drag modes that determine the behavior of regions when you
edit them. You can set the drag mode in the Drag pop-up menu, available in the Arrange
area and several other editors.
Note: The Drag pop-up menu options discussed in this section refer to regions. The
behaviors outlined below (for regions) are identical for dragged events in the editor
windows. The Drag pop-up menu setting of the Arrange area and each editor window
is independent.
367 Chapter 13 Creating Your Arrangement