Apple Logic Pro 9 - Manual (Page 883)

The trill line and arpeggio lines can be set to any length, by dragging their end points.
The trill line can also span line breaks.
The accidental symbols in this Part box group are purely graphical, and do not affect the
MIDI playback of notes. They are mainly intended as a supplement to trill symbols.
Rests and Bar Repeat Signs in the Part Box
Rests are displayed automatically in Logic Pro.
Existing notes and automatic rests always add up to complete bars, which match the
given time signature.
Note: The only exception is when a staff style with a deactivated rest display (Hide Rest)
or with beat slashes (instead of rests) is used.
In certain situations, you might want to insert rests manually. These manually inserted
rests (also called user rests) can be used if you don’t like the way a particular automatic
rest is displayed. See
Creating and Inserting Rests in the Score Editor .
Text Objects and Chord Symbols in the Part Box
Descriptions of the extensive range of text objects and chord symbols can be found in
Working with Standard Text .
883 Chapter 31 Working with Notation