Apple Logic Pro 7 - Manual (Page 503)

Chapter 16 Score Editor 503
If you want to change an already inserted clef, double-click on it. This opens the
following selection box. (The same applies to the “basic” clef of a MIDI Region, however,
changing this clef affects the Score Style itself, as well as all Regions that use the same
Score Style.)
The option Smaller Clef Changes in Layout > Clefs & Signatures also affects clef changes.
All clefs, except the first one in every staff, will be reduced in size, depending on the
value set here. This will happen, regardless of whether the clef changes are caused by
using a different Score Style in the same staff, or by inserting clefs from the Part box.
Octave settings
The four symbols on the right hand side do exactly what you expect them to: they
mark a section to be played either one or two octaves higher resp. lower. The length of
the section can be edited after insertion by grabbing the end of the line and moving it
horizontally.
Dynamic Symbols
These symbols can be inserted at any position in the score. They are graphic symbols
only, and thus have no effect on the playback of the Regions they are placed in.