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THREE-DIMENSIONAL MOTION PICTURES get their signals from a single track, whereas in the two- track systems, the recording on one track may be asso ciated with one side of the image, that of the other track with the opposite side. "Vitasound" is the simplest of the group. It uses only two ' amplifying channels, although with three speaker systems. In a theater which at present has regular and emergency full-power amplifiers and three sets of speak ers backstage, conversion to Vitasound operation would be comparatively simple. The existing soundheads would be modified for Vitasound reproduction (they would retain their capacity to play ordinary tracks in the ordinary way). The existing amplifier channels would be modified for variable gain operation, which would not involve sacrifice of their ability to function in the usual manner; and a control panel for handling the variable-gain control currents would be installed. That, and some changes in wiring to the amplifiers and the speakers, is all that would be required. In the case of existing systems having but one full- power channel, and less than three complete sets of speakers backstage, it would be necessary to add a sec ond channel, and a suitable number of additional speak ers. Vitasound is recorded on an ordinary track, exactly like any other sound. Additionally, however, the film carries a second track for control purposes, which is placed in the line of the sprocket holes, and carries a simple controlling signal for actuation of the variable- gain features of the amplifiers. The special track works in this way: When the area between the sprocket holes is entire opaque, the special .second photocell is illuminated only when a sprocket hole passes through the special exciting light. Since there are four sprocket holes per frame, and 24 frames per second, a 96-cycle signal results. This signal is of maximum intensity when the area between the sprocket