Apple Final Cut Pro 5 - Manual (Page 1064)

Chapter 13 Adjusting Parameters for Keyframed Effects 277
II
To change the angle between one side of a Bezier curve and the other:
m Hold down the Command key as you drag a Bezier handle. Release the Command key
to lock the new relative angle of the two handles back together.
To change the lengths and the angle of the selected Bezier handle
independently of one another:
m Hold down the Command and Shift keys as you drag a Bezier handle.
To remove Bezier handles from a keyframe in a motion path, do one of
the following:
m Control-click a keyframe in the Viewer, then choose Make Corner Point from the
shortcut menu.
m Select the Pen Smooth tool (press the P key three times), then click a curved keyframe.
Press Command, then drag to
resize one side differently than
another.
Press Command and Shift, then
drag to resize and change the
angle of one side only.