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Realistic sound effects provide a great deal of the realism at Walt Disney’s 160-acre "Disneyland" park at Anaheim, California, thus heightening the illusion of a simulated trip to the moon or a river cruise through the African jungle, hence the extensive array of audio equipment. A full-time service crew consisting of six technicians is required to maintain 290 loudspeakers, more than 40 miles of wiring, 13 long-playing magnetic tape playback units, and some 150 cartridge-type tape program repeaters. In addition, associated timers, amplifiers, and other equipment is spread over the lot. All in all, there are seven control centers on the grounds at "Disneyland." One entire section of the park is a simulated African jungle in which three types of sound effects are required. They are: intermittent localized effects which must come in "on cue" such as the trumpeting of a mechanical elephant as visitors approach on one of the five-eighth scale riverboats; continuous localized effects such as a constant chattering of monkeys in one area of the "jungle"; and, continuous overall effects which would be heard virtually anywhere in the jungle at all times such as the roar of lions, bird sounds, and the noises of crickets and frogs at night. All sound effects are on magnetic tape and various types of control devices such as photoelectric cells, timers, and the magnetic tapes themselves turn the effects on and off automatically. One particular device, especially devised for the "Disneyland" project, "moves" the background noises from one section of the jungle to another quite realistically. This is a "continuous automatic fader." […]