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50 phons audibility threshold auditory range begin simultaneously boundary regions c.p.s. n db c.p.s. tone central auditory central frequency centre change of sound cm./sec const cp.s D.A. SINCLAIR descending minor diff duration ELECTRONIC MUSICAL COMPOSITION end simultaneously envelope curves equal sound intensity frequencies 1920 frequency multiplied gain step group of tone initial tones intensity series limits of audibility major third maximum gain stage maximum intensity maximum sound intensity minor tenth National Research Council Northwest German NRC TT octave key proportional series pure tone quency ratio relative sound intensities reverberation added sequence echo sequence grouping sequence second system Sequences horizontally Sequences in structure Sequences vertically pause series of six sinusoidal tones six tone Sounds in sequence strongest component strongest tone structural transposition superordinate tape Technical Translation TT-611 three dimensions timbre tone and silence tone groups tone mix tone mixture Tones in tone upper system vertical group weakest component