Flex Pitch algorithm and parameters in Logic Pro for Mac
Flex Pitch is a track-based setting that determines how the pitch of your audio material can be altered. The algorithm comes with three parameters, located in the Track inspector.
Note: When you choose a flex algorithm for a track, the Freeze Mode parameter in the Track inspector switches from Pre Fader to Source Only. This freezes the track signal without any effects plug-ins. For details, see Freeze tracks in Logic Pro.
Use the Flex Pitch algorithm
In Logic Pro, turn on flex, then choose Flex Pitch from the Flex Mode pop-up menu.
Flex Pitch includes the following parameters:
Formant Track: Determines the interval at which formants are transposed along with the pitch.
Formant Shift: Determines how formants adjust to pitch shifts. When set to 0, formants are adjusted together with pitch shifts.
Formants pop-up menu: Choose how Flex Pitch processes formants.
Process always: All formants are processed.
Keep Unvoiced Formants: Only voiced formants are processed. Sibilant and plosive sounds are retained, producing a more natural-sounding effect.
When you turn on Flex Pitch, the destructive editing features in the Audio File Editor are deactivated. If you plan on using Flex Pitch and making destructive edits to an audio file, you’ll either need to make the edits before activating Flex Pitch, or bounce the region in place after using Flex Pitch but before making edits to the audio file. For more information about audio file editing, see Overview of the Logic Pro Audio File Editor.