Choose the Flex & Follow setting in Logic Pro for Mac
On Flex enabled audio tracks, the Flex & Follow pop-up menu replaces the Flex checkbox for audio regions in the Region inspector. You use the Flex & Follow setting to enable Flex Time for a region, to set whether it follows the project tempo, and to set whether it additionally uses Smart Tempo beat markers at the bar or beat level.
You can edit Smart Tempo beat markers in the Smart Tempo Editor. If the Flex & Follow pop-up menu is set to Bars or Beats, edits in the Smart Tempo Editor immediately update in the region displayed in the Tracks area (similar to how transient markers update when an audio region is quantized).
When you open a project created in an earlier version of Logic Pro for Mac, audio regions in projects for which the Flex checkbox was selected (turned on) have their Flex & Follow parameter set to On. Audio regions for which the Flex checkbox is unselected (turned off) have their Flex & Follow parameter set to Off.
Choose the Flex & Follow setting for an audio region
In Logic Pro, select the audio region.
In the Region inspector, select one of the following from the Flex & Follow pop-up menu:
Off: The region does not follow changes to the project tempo, and is not Flex enabled.
On: The region is Flex enabled, so it follows any manual Flex edits. It also follows any changes to the project tempo.
Bars (On + Align Bars): The region is Flex enabled, and Smart Tempo beat markers are used to conform the region to the project tempo at every downbeat (bar).
Because the region is conformed to each bar, the 1/1 setting is not available in the Quantize menu.
Beats (On + Align Bars and Beats): The region is Flex enabled, and Smart Tempo beat markers are used to conform the region to the project tempo at every beat.
Because the region is conformed to each (1/4-note) beat, the 1/1, 1/2, and 1/4 settings are not available in the Quantize menu.
You can set the default Flex & Follow settings for audio recordings and imported audio files in the Smart Tempo project settings.