A device that can selectively filter and modify various frequen¬cies of a sound track. This can be implemented in hardware, and you'll have a set of pegs to be pushed up or down to change the intensity of the related frequency. In software, you'll have sliders in the media player. Depending on the number of distinct frequency bands it can filter, there are 2-band, 5 band, etc. graphic equalisers.

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