Apple Final Cut Pro 6 - Manual (Page 1101)

316 Part II Effects
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 with Bezier handles in the Canvas, then choose Make Corner
Point from the shortcut menu.
m Select the Smooth Point tool in the Tool palette (or press the P key three times), then
click a keyframe with Bezier handles.
Press Command, then drag to
change the angle between one
side of a Bezier curve and the
other.
Press Command and Shift, then
drag to resize and change the
angle of one side only.