Rodgers Allegiant 657, Owner'S Manual

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In Werckmeister III, four tones are practically tuned identical to Equal Temperament (C, D#,
F# and A).
Young I and II: Young Temperaments offer further refinements to the Mean-Tone model,
except with slightly higher pitched sharps.
Equal: Equal Temperament is the modern standard that uses a succession of 12 semitones of
equal size, allowing performance in all keys successfully. The fifths are slightly narrowed
and the upward thirds are considerably sharp, but unlimited modulation from key to key is
possible.
Selecting a Temperament
To select a temperament:
1. Press and hold the SET.
2. Rotate the Select knob counter-clockwise until TEMPERAMENT appears in
the display.
3. Rotate the Alpha dial until the selected temperament appears.
4. Press General Cancel (‘ 0 ’) to exit.
Random Detuning
One of the essential ingredients of a pipe organ ensemble arises from the small amount of pitch
deviation in each pipe. No matter how carefully an instrument is tuned, small changes in
temperature or humidity cause the pipes to drift slightly from their original pitches. Reed pipes
are especially prone to drift in tuning because of cyclic temperature variations.
The Random Detuning feature causes random notes to receive a small amount of detuning. The
amount of detuning is chosen at random for each note of each voice. Some notes are not detuned
at all. The number of notes detuned and the maximum amount of detuning are selected for each
voice to mimic the behavior of an equivalent pipe set. For instance, reeds exhibit more pitch
fluctuation than flutes. Because the detuning is random, there is no degradation of the overall
temperament of the instrument and the amount of detuning is no more than one would
experience in a recently tuned pipe instrument.
This detuning process happens each time the organ is turned on. Once computed, the pitch of
each note remains constant. Thus, the tuning of the instrument is a little different each time it is
powered on, as it would be with a pipe organ. The amount of Random Detuning present in the
organ is set by a Rodgers representative during final voicing.
When the organ is turned off, temperament reverts to Equal , the default setting.
Also, the instrument can be quickly returned to Equal temperament by holding SET
and momentarily pressing General Cancel (‘ 0 ’). This Reset procedure also returns
MIDI settings and Voice Palette selections to their defaults.
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