You can adjust the automation for any effect parameter. For example, you can change the amount of flanger over time. To do this, add the "Acoustica Flanger" effect to a track.
Then click the track header's "Toggle Automation" button to show the automation lane.
Choose the effect parameter you'd like to automate. In this case, we choose 'Feedback'
After that, we can draw in automation points to change the feedback over time.