The study of the nervous system’s cognitive response to sound stimuli is known as psychoacoustics: it is part acoustics and part psychology. The visual system is often considered the more important sensory modality, but the auditory system is far faster in its analysis and response to incoming sensory information. It is when we first begin to work with sound recording that we become aware of many of the subtleties present in our auditory system. For example, phenomena such as masking, in which only the louder of two sounds close together in frequency is perceived, are attributable to the behavior of our auditory physiology. All ...