Rodgers Trillium T797, Owner'S Manual

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8. Rotate the Alpha dial to select
Flexible
,
Normal
, or
Fixed
.
9. 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 selected 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.
Shutter Thickness
The minimum volume of each division when its Expression Shoe is closed can be adjusted to suit
specific musical needs or personal tastes. In the Pipe Modeling category, the
Shutters menu
allows four settings: pp , ppp , pppp , or UnEncl . As shutter thickness increases, the volume of
the division when the expression shoe is completely closed decreases.
Setting Shutter Thickness Minimum Volume
pp Thin soft
ppp Medium quite soft
pppp Thick very soft
This Pipe Modeling feature is analogous to adjusting the thickness of expression shutters on a
pipe organ; the thicker the shutters, the less sound transmitted when the expression shoe is
closed. In all cases, the settings do not affect the sound when the expression shoe is open.
Should you ever desire that a division not respond to movement of the expression shoes, you can
set the division to Unenclosed (“ UnEncl ”). This setting, however, is usually only selected when
The Wind Supply setting is saved when the organ is turned off.
!