My understanding of just intonation is that it requires one to practice a sort of situational intonation, making each pitch fit within its harmonic context. Now, if I am playing F sharp in the context of a major third with D, it will need to be low. But if I add another third under the D and have a B minor chord, then the F sharp will need to be slightly higher in order to make a better fifth with the B. What do I do when a single pitch changes harmonic context while it is being held or reiterated? Say, for instance, the F sharp started out as the third of D major and then suddenly became the fifth of B minor? Do I change the pitch as I am playing the note? What if I am called upon to play a (high) E flat harmonized with a G below in a minor sixth, and then the E flat becomes the seventh of a diminished seventh chord built on F sharp? The E flat will then be too high, will it not?
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