Rodgers Allegiant 657, Owner'S Manual

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23
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’ Quintflöte two octaves and a fifth above
Mutations are most commonly from the flute family and are often used with other flute stops in
solo registrations or ensembles used in 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.
Registrations using mutations with other flute stops
8’ 4’ 2-2/3’ 2’ 1-3/5’ 1-1/3’
* *
* * *
* * *
* * *
* * * * *
Larger organs will often have one or two mutation stops from the principal family. In most
cases, these ranks are used to add color to the principal chorus.
Celeste ranks
Celestes are unique among organ stops in that they are intentionally tuned sharp or flat in relation
to the rest of the instrument. Celestes are paired with a partner rank (often called a “unison”),
which is similar in color to the celeste rank but is in tune with the balance of the organ.
When the unison and celeste are drawn together, the tuning discrepancy between the two ranks
creates a beautiful undulating quality suitable for lush, romantic textures. Celestes are either
from the string or flute family. The latter is usually the quieter of the two.
Intermanual couplers
Intermanual couplers enable stops of one division to be played on another keyboard or the
pedalboard. Examples of intermanual couplers are SWELL TO GREAT , and GREAT TO
PEDAL . These couplers are located on the lighted tilt tabs above the Swell manual.
The first name listed in the coupler is the division that is being “coupled”; the second name
denotes the division to which the division is coupled. “Swell to Great” literally means, “Connect
the
Swell division to the Great manual.”
The SWELL UNISON OFF coupler is quite unique in that it silences notes at concert or unison
pitch (hence, the name). For example, selecting the SWELL UNISON OFF coupler would
cause activated stops in the Swell division to be silent even when notes are played on the Swell
manual.