Use Extreme Tuning in GarageBand for iOS - Apple Support
May 12, 2017 · Set the key and scale of the song. Extreme Tuning uses your song's key and scale settings to apply the effect. If the actual key or scale of your song differs from the key or scale setting, the effect might be less pronounced, or might change the pitch of individual notes in the track in undesirable ways. GarageBand songs defaults to the key of C. On iPhone and iPod Touch, tap Settings in the control bar, and then tap Song.
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