Mixing : Automation : Creating Snapshot Automation : Writing Snapshot Automation over Existing Automation Data

Writing Snapshot Automation over Existing Automation Data
When you move the playback cursor, the automated controls in Pro Tools update to reflect the automation data that is already on the track. To keep the settings you have made for a snapshot, you can suspend automation parameters to prevent them from updating.
To write snapshot automation over existing data:
1 In the Automation window, make sure that the automation parameters you want to edit are write-enabled. Deselect any parameters whose automation you want to preserve.
2 Adjust the controls for the parameters you want to automate.
3 Click the Automation Mode selector and select Off mode for the tracks where you want to apply the automation.
4 With the Selector, select the range where you want to apply the automation.
5 Choose Edit > Automation and select one of the following from the submenu:
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To write the current value to only the automation parameter currently displayed in the Edit window, choose Write to Current.
– or – 
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To write the current settings for all automation parameters enabled in the Automation window, choose Write to All Enabled.
6 Click the Automation Mode selector and select Read mode for the tracks you want to play back with automation.