Playback and Recording : Audio Recording : Setting Pre- and Post-Roll : Dragging Pre- and Post-Roll Flags in the Timebase Ruler

Dragging Pre- and Post-Roll Flags in the Timebase Ruler
The Pre- and Post-Roll Flags can be moved in the Main Timebase ruler, either separately or at the same time, to set their location.
To set the pre- and post-roll amounts by dragging in the Main Timebase ruler:
1 If you want the Pre- and Post-Roll flags to snap to the current Grid value, set the Edit mode to Grid.
2 Drag the Pre-Roll Flag to a new location in the ruler.
 
3 Drag the Post-Roll Flag to a new location in the Timebase ruler.
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To set pre- and post-roll values to the same amount, Option-drag (Mac) or Alt-drag (Windows) either the Pre- or the Post-Roll Flag in the ruler. The deselected flag will immediately reset to the same value, and will adjust accordingly as you drag the selected flag.