John For tuning sequences that begin on C, the C needs to be modified from 523.3 to yield an A440. For example: 1/4 comma Mean Tone put C at 526.36Hz Werk III put C at 526.8Hz Kirnberger III put C at 526.36Hz Kellner put C at 525.74 Hz Vallotti put C at 525.02 Hz Young put C at 525.02Hz Hope this helps Rob Thornton
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