Apple GarageBand 3 - Manual (Page 65)

Chapter 8 Working in the Editor 65
Controller information is displayed as a line with “dots” at different points in time,
similar to the way volume and pan curves are displayed in the timeline. Each “dot”
(called a control point) shows a change in value (in this case the movements of the
controller) at that point in time. You can edit the controller information by adding new
control points, and by adjusting control points to change their value or to change
where in the timeline they occur.
To add a control point:
m Click the line in the editor at the point where you want to add a control point.
To adjust a control point, do one of the following:
 Drag the control point up or down to a new value.
 Drag the control point left or right to move it to a different point in time.
You can also view and edit Software Instrument regions in notation view in the editor.
For information about notation view, see “Working in Notation View” on page 66.