Apple Logic Pro 9 - Manual (Page 812)

To view all recorded automation data on subtracks
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Option-click the (closed) triangle to open up to 30 automation subtracks, which will
display existing (already recorded) automation data.
Only as many automation subtracks as required will open, so if you have recorded
automation data for ten parameters, nine subtracks will open. The active automation
parameter remains on the top track.
Option-click the open triangle to collapse all automation subtracks. The automation data
remains active, and will play if the automation mode of the main track is not set to Off
or Write—even if the track is not visible.
Setting an Automation Mode
Automation modes determine how automation tracks are handled. Essentially, automation
is either off, being read, or being written. You can independently choose the automation
mode for every channel strip.
To set the automation mode for a track
Do one of the following:
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Choose a mode in the track header’s Automation Mode menu.
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Choose a mode in the Automation Mode menu on a channel strip in the Mixer or Arrange
channel strip.
812 Chapter 28 Working with Automation