A content item is updated in response to advancing capabilities of a client. The current digital-to-analog converter receives a digitally filtered input waveform including at least two voltage steps. A second computer is used by a user to input custom data. A first channel is defined by the first plate and the first lobe and the second plate and the second lobe with the rope moveable through the first channel wherein tension on the rope rotates the first plate and the second plate relative to each other thereby narrowing the first channel and impeding movement of the rope through the first channel.