Apple Logic Pro 9 - Manual (Page 945)

To create a key signature
Do one of the following:
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Click a position in the Signature track’s key signature area with the Pencil tool, then choose
a key in the Key Signature window.
Note: You can disable the use of double flats and sharps by deselecting the “Disable bb,
x” checkbox.
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In the Score Editor, double-click a staff between the clef and time signature, then choose
a key in the Key Signature window. You can also drag the key signature from the Part
box to the appropriate bar position.
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Click the Create Key Signature button in the Signature List.
Selecting Signatures
You can select signatures in the Signature List and Signature track by clicking them.
Multiple selections are possible by Shift-clicking.
In the Signature track, you can even select multiple signatures in conjunction with regions,
a technique that is very useful when you want to copy or move complete parts of a song
(along with signature changes). The Edit > Select Inside Locators command can be helpful
in this situation.
Note: When a marquee selection is active, using this key command sets the marquee
selection to match the locators.
945 Chapter 31 Working with Notation