Modulate
Nuttall's Standard Dictionary of the English Language · 1890 · p. 121
intone;e; mod'-u-late, to change the v.a. key to adjust or mode; to [Music] vary or: inflect v.n. to pa from one key to another [Music].
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Chamber's Twientieth Century Dictionary (1908)
Chamber's Etymological of the English Language (1895)
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