While operation of the Model 24's two primary functions (Stepped
Random and Smooth Random) is intuitive and fully indepentent of one
another (two independent random voltages simultaneously, each having
it's own control of speed, center point and vertical displacement),
some of the it's secondary uses may not be as obvious to the new user
and have been diagramed on the M24 page of the EAR site. Go here, and
scroll to 'Sample Patches':
http://www.ear-group.net/model_24.html