Rodgers A698 Instruções de Operação descarregar pdf (Página 29)

Mutation Common name Relationship to concert pitch

2-2/3’ Nazard one octave and a fifth above

1-3/5’ Tierce two octaves and a third above

1-1/3’ Larigot two octaves and a fifth above

Mutations are most commonly from the flute family and are often used with other flute stops

in registrations or ensembles for early organ music. Because mutations often appear in

divisions with a number of other flute stops, a great diversity of solo color can be achieved by

using various combinations of stops. See the following table for common solo registrations

utilizing mutations.

Common Registrations for a Solo Melody

Using Flute Stops and Mutation Stops

Flutes 8’ + 4’ + 2-2/3’ + 2’ + 1-3/5’

Flutes 8’ + 2-2/3’ + 1-3/5’

Flutes 8’ + 4’ + 2-2/3’

Flutes 8’ + 4’ + 2-2/3’ + 2’

Flutes 8’ + 4’ + 1-1/3’

Larger organs may have one or two mutation stops from the principal family. In most cases,

these ranks are used to add color to the principal chorus.

• Roman Numeral? It’s a “Mixture” stop.

Mixture stops are easily identified because of a Roman numeral. Mixtures consist of multiple

Principal ranks; the Roman numeral following the name denotes the number of ranks contained

in the mixture. For example, a Mixture IV stop contains four ranks of Principal pipes. (A “rank”

is a distinct set of pipes. Most stops consist of one rank of 61 pipes = one pipe per keyboard

note. A four-rank mixture would have 4 pipes playing on each note.) Common mixture stop

names include:

Mixtur, Mixture Cymbale Chorus Mixture Grand Fourniture

Fourniture Zimbel Grave Mixture Harmonics

Plein Jeu Scharf, Scharff Rauschquint Acuta

• Céleste stops

Célestes are unique among organ stops in that they are intentionally tuned sharp or flat in

relation to the rest of the instrument, thereby producing an undulating (or “wavy”) effect.

Célestes are paired with a partner stop (often called a “unison”) which is similar in color to the

céleste stop but is in tune with the balance of the organ. When the unison and céleste are

drawn together, the tuning discrepancy between the two stops creates a beautiful undulating

quality suitable for lush, romantic textures. Célestes are either from the string or flute family,

with the latter usually being the quieter of the two. Some Céleste stops have a “II” (Roman

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Rodgers A698 Instruções de Operação Página 29