Apple Logic Pro 8 - Manual (Page 415)

Chapter 16 Editing MIDI Events in the Piano Roll Editor 415
 Choose the desired View > Hyper Draw command.
 Click the Hyper Draw button at the lower-left corner of the Piano Roll Editor, then
choose the desired MIDI controller by clicking the arrow button to the left.
The selected controller type (volume, for example) is shown in a gray field below the
Piano Roll grid.
2 Click at different points in the gray area to create Hyper Draw nodes.
A connecting line is automatically created between the nodes.
To resize the Hyper Draw area:
m Grab, and vertically move the dividing line that separates it from the Piano Roll grid
area.