mixture stop

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mixture stop. Org. stop in which each finger-key (or pedal-key) played operates on a group of pipes corresponding to the fundamental and some of the higher harmonics of the note of that key. The group may be of from 2 to 10 pipes and the stop is then spoken of as having that number of ranks (indicated in order specifications in Roman figures). It cannot be used alone, but adds brightness and richness when combined with stops of normal pitch in ‘Full Organ’, etc. See also sesquialtera.