Mixing : Automation : Priming Controls for Writing Automation in Latch Mode

Priming Controls for Writing Automation in Latch Mode
For more information, see the following topics:
(Pro Tools HD and Pro Tools with Complete Production Toolkit Only)
If a track is in Latch or Touch/Latch automation mode, you can prime individual controls for writing automation while the transport is stopped. This Latch Prime capability lets you prepare for an automation pass before starting playback.
To prime controls for writing automation in Latch mode while the transport is stopped:
1 Choose Setup > Preferences and click Mixing.
2 Under Automation, select Allow Latch Prime in Stop.
3 Click OK to close the Preferences window.
4 In the Automation window, make sure the controls you want to automate are write-enabled.
5 Click the Automation Mode selector on the track where you want to write automation and do one of the following:
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Choose Latch mode to allow priming of all automation-enabled controls on the track.
– or – 
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Choose Touch/Latch mode to leave the main Volume fader in Touch mode and allow priming of all other automation-enabled controls.
6 While the transport is stopped, touch or move the controls you want to start writing at the beginning of the automation pass. When at least one control on a track is primed, the Automation Mode selector displays in red.
 
Automation mode indicator before (left) and after priming of latched controls (right)
7 Start playback. All primed controls begin writing automation at their primed values.
8 Stop playback to finish the automation pass. All tracks are taken out of their Latch Prime state.
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You can use the Write to Punch command at the end of your automation pass to write the current value back to the start of the pass.