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THREE-DIMENSIONAL MOTION PICTURES i?9 this system can soon be made available to all theaters in a somewhat simplified form. It is noteworthy that, aside from the special multi- track soundheads and variable gain amplifiers, all com ponents of this special sound system are standard sound reproducing items that are being sold with current theater sound equipment. This means that if the appli cation of these special recording methods becomes more general, the sound equipments now installed in theaters will not become obsolete but instead may be used as the main part of a new enlarged system. Because Disney wanted to produce unusual effects with acoustic perspective, making the sound appear to move about the auditorium and issue from many sources instead of only one as in a standard sound reproducing system, it was necessary to expand the Fantasound sys tem into three complete sound systems, with three sepa rate amplifier channels and three stage speaker setups located on the right, center and left of the stage, re spectively. To supply each of these three channels with separate sound sources, it was necessary to use three program soundtracks instead of the usual one. Then to auto matically adjust the volume level of each channel to get greater volume range and more realistic reproduc tion, it was necessary to use a fourth track, which is known as the control track. Obviously, there was not room on a standard film for four soundtracks, so a special sound film carrying the three program tracks and the control track was recorded on standard 35 mm. stock. In reproduction, the sound film and the picture film are run simultaneously, the former in a special multi-track soundhead and the lat ter in a standard picture projector. The control track has three separate tones recorded on it, superimposed on one another. The tones used are 250, 630 and 1600 cycles. As will be shown later, the in tensity of each of these tones determines the loudness