1. A method of coordinating the individual outputs of a plurality of output elements, comprising: receiving, at each of a plurality of input elements each having input means, a reference signal from a device; determining, for each input element, at least one input characteristic of said reference signal as received by said input element, thereby forming a set of characteristics of said reference signal; determining, from the set of characteristics of said reference signal as received by said plurality of input elements, a set of output characteristics; sending a data signal to each of said plurality of output elements; and using, at each given output element of said plurality of output elements, at least one output characteristic of said set of output characteristics to modify the individual output of said data signal output by said given one of said output elements.