The Key Signature ruler lets you add, edit, and delete key signatures. You can use key signatures to indicate key and key changes in your Pro Tools session. Key signatures can also be used for certain diatonic functions, such as transposing in key or constraining pitches to the specified key.
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Select View > Rulers > Key Signature.
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From the Ruler View selector in the Edit window, select Key.You can also show or hide the Key Signature Staff for the Key Signatures ruler.
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Select View > Rulers > Key Signature Staff.
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Click the Show/Hide triangle on the Key Signature ruler.