contraviolone

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I remember on the Great at St Pauls Cathedral there were two Principal 4 stops (Principal I and II rather than Principal/Octave) after the 1972/77 rebuild. But this was changed during the 1990s I think, with one of the Principals displaced with a new Claribel Flute. At the same time the South Choir gained (or regained?) a Principle 4 (was this simply transfered from the Great?). Has this made the registration on the Great any easier now there is only one Principal 4? With two Open Diapasons I assume the second Diapason (the old one) now sings alone, or can the single Principle make do for both?

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