Apple Logic Pro 9 - Manual (Page 809)

The gray automation area appears on all tracks, and the Automation Parameter menu is
displayed in the track header. This allows you to choose the visible automation parameter.
It is automatically set to Volume.
Automation Parameter
menu
Automation can only be displayed when a track is of a sufficient height. Turning on track
automation automatically sets a suitable vertical zoom level.
To resize one or more tracks
µ
Drag the lower-left corner of a track header (in the track list) to resize it. Alternately, you
can use the vertical zoom bars to resize all tracks, if automation is not visible.
This can happen if you have manually resized a track, or changed the zoom level after
activating automation.
Displaying Different Automation Parameters
You can choose the parameter that you want to view and edit in the Automation
Parameter menu. This appears below track names in the Arrange track list.
809 Chapter 28 Working with Automation