Apple Logic Pro 9 - Manual (Page 525)

To assign a flex mode to an audio track
Do one of the following:
µ
Click the Flex Mode button in the arrange track list, then choose a mode from the pop-up
menu.
µ
Select the Flex Mode parameter in the Track Parameter box, then choose a mode from
the pop-up menu.
The flex mode you choose is assigned to all audio regions or audio take folders across
the track.
Note: When you set the flex mode for a track, the Freeze Mode parameter in the Track
Parameter box switches from Pre Fader to Source Only. For details about the Freeze
feature, see
Freezing Tracks in the Arrange Area .
525 Chapter 16 Flex Time Editing