Apple Final Cut Pro X (10.1.2) - Manual (Page 209)

Chapter 8 Edit audio 209
Preserve pitch when retiming clips
By default, Final Cut Pro preserves pitch when retiming clips so that the pitch doesn’t sound
higher when the clip is faster or lower when the clip is slower. You can turn this feature on or off
before or after a clip has been retimed.
Turn Preserve Pitch on or off
1 In the Timeline, select an entire clip, or a range within a clip, whose speed you plan to change.
2 Choose Preserve Pitch from the Retime pop-up menu in the toolbar.
A checkmark to the left of the command name indicates that Preserve Pitch is turned on. To turn
it off, choose Preserve Pitch again.
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