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Logic Pro can analyze a series of selected chords—either on the Chord track or on a Session Player region—to determine the key signature, and then add the determined key signature to the Signature track as a key signature change.
In Logic Pro, select a series of chords on the Chord track. The selected chords can be individual chords, grouped chords, or a mixture of both, but they must be contiguous.
Control-click the selected chords, then choose Analyze Key Signature from the shortcut menu.
Logic Pro analyzes the selected chords to determine the key signature, and then adds the determined key signature to the Signature track as a key signature change.
If no key signature change exists in the project before the last of the selected chords, the initial key signature changes to the result. If a key signature change does exist, a key signature change event is added at the start position of the first selected chord.
In Logic Pro, select a Session Player region in the Tracks area.
Do one of the following:
Control-click the region, then choose Chords > Analyze Key Signature from the shortcut menu.
Click the Editors button 
to open the Session Player Editor (if it is not already open), then choose Chords > Analyze Key Signature from the Session Player Editor menu bar.
Logic Pro analyzes the selected chords to determine the key signature, and adds the determined key signature to the Signature track as a key signature change.
If no key signature change exists in the project before the last of the selected chords, the initial key signature changes to the result. If a key signature change does exist, a key signature change event is added at the start position of the first selected chord.