For calculating purpose, the fundamental is chosen from standard pitch, A4=440 Hz. In practice, it can use any pitches. The unison and octaves of fundamental have zero deviation because it's assumed to be perfectly match to Equal-Tempered counterpart.
From strangers to singers
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When you’re leading a one-off singing workshop, or have large influx of new
members to your choir, there will be lots of people who don’t know each
other...
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