1. A data sonification system for representing a plurality of channels of numerical information using variations of timbre of audio frequency waveforms, the system comprising: a plurality of audio waveform generators, each generating an associated audio frequency waveform, wherein each audio frequency waveform comprises an audio frequency and at least one adjustable timbre control parameter, each timbre control parameter having an associated adjustable a value; and a mapping element for associating aspects of multidimensional numerical data with the at least one timbre control parameter of each of audio frequency waveforms from the plurality of audio frequency waveforms, wherein the mapping element adjusts the value of the timbre control parameter responsive to values of the multidimensional numerical data, and wherein the timbre of the audio frequency waveform carries information responsive to values of underlying data for presentation to a user.