Mixing : Automation : Enabling and Suspending Automation : Automation Enable Guidelines

Automation Enable Guidelines
The following rules determine whether automation is enabled for a track:
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Although Pro Tools shows a single Automation mode for each track, all automatable controls associated with that track are not necessarily in the same Automation mode.
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If automation is globally suspended in the Automation window, all automatable controls behave as if they were in Off mode, regardless of the track’s current Automation mode.
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If automation for a control is suspended by Control-clicking (Windows) or Command-clicking (Mac) its name in the Track View selector, that control behaves as if it were in Off mode, regardless of the track’s current Automation mode.
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If automation for a control is suspended in the Automation window, that control behaves as if it is in Read mode when the track is in a recordable Automation mode (Touch, Latch, or Write mode).