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"Density" is a piece for harp and computer. A program, written in Max/MSP, generates electronic sound in response to musical input and also process the instrumental sound. The “granular arpeggiator”, developed by the composer, is mainly employed to process harp sound. It extracts grains out of harp sounds and arpeggiates them. It combines two sets of more than ten tables, tempo and pitch tables, in different ways to alter the tempi and the pitches of arpeggios. In most cases when a table, stored in the patch in advance, is recalled one by one, the arpeggios are altered not immediately but gradually. In addition to that, several DSP techniques such as formant synthesis, filtering, cross synthesis, flanger, and pitch shifter are employed to process the sounds of both harp and
the arpeggiator.
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