【實用音樂app】RatioKey|最夯免費app

RatioKey provides a dense selection of tones (105 over an adjustable 2-octave range), all related to the center (1/1) tone by frequency ratios composed entirely of low powers of the first five prime numbers (2, 3, 5, 7, & 11). Any two tones with frequencies related by a simple integer ratio constitute what is sometimes called a "pure" interval.

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