A modulation analyzer includes a smoothing processor which processes the coordinates of symbol landing points to generate a curve that optimally fits the landing points under a selected criterion. The user controlled device includes one or more controllers, which are configured for orientation of a stereo field, orientation of a projection surface relative to a camera, use of converging stereo rays or parallel stereo rays, control over the zero-parallax distance for converging rays, and control over the interocular distance. In one embodiment, the total sum includes an additional score for each of a starting word and an ending word of the first word sequence, wherein each respective additional score is associated with a probability that the starting word is used as the first of an address. The charge transport layer, which can be an overcoat overlying the charge generating layer, comprises the condensed reaction product of the disclosed polymers.