Tracks which have automatable controls, such as Fader, Pan and parameters of Plugins they contain will have an option to show their Automation Lanes.
You can choose which parameter you want to automate in each Automation Lane.
Editing automation consists of creating automation regions and then creating automation events inside the automation editor. See the Editing chapter for details.
The control corresponding to each automation lane will use the value from the automation lane if there are automation events present at the current playhead position.
If there is no automation at the playhead, the control will use the last known value, either from the automation lane or from a manual change.
This behavior also applies when rendering (exporting) the project.