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(a) Waves alternately in and out of phase, giving rise to the ‘beat’ phenomenon; (b) waveform of two notes exactly an octave apart, giving a smooth and steady impression; (c) waveforms of notes not quite an octave apart, ‘changing step’; in each case the locked

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(a) Waves alternately in and out of phase, giving rise to the ‘beat’ phenomenon; (b) waveform of two notes exactly an octave apart, giving a smooth and steady impression; (c) waveforms of notes not quite an octave apart, ‘changing step’; in each case the lowest graph is the sum of the other two...

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