Rodgers Trillium T967, Owner'S Manual

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8’ intermanual couplers are commonly used when building a large ensemble registrations,
whereas 16’ and 4’ couplers are usually not employed.
16’ and 4’ couplers are often used with celeste stops in gentler registrations; they effectively
increase the number of notes which are sounding and increase the warmth and breadth of the
ensemble.
Intramanual couplers
Intramanual couplers are different from intermanual couplers in that they operate within a
single organ division. These couplers allow you to play stops of the organ at a different
pitch level on the
same manual where the stop is located. Examples of intramanual couplers
in the Swell Division are SWELL TO SWELL 16' , SWELL UNISON OFF and SWELL
TO SWELL 4' .
When the SWELL TO SWELL 16’ coupler is activated, a single note played on the Swell
manual will cause two notes to sound, the note which is played and the note which is one
exactly octave below. These couplers are often known as a
sub-octave couplers.
When the SWELL TO SWELL 4’ coupler is used, a single note played on the Swell manual
will cause both the note which is played and the note one octave above to be heard. These
couplers are often known as
octave couplers.
The relationship between notes played and heard when these two types of couplers are used
is shown below.
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. This coupler is invaluable when you want to transpose the effective range
of a stop up or down an octave.
For example, selecting both the SWELL UNISON OFF and SWELL TO SWELL 16’
couplers would cause all activated stops in the Swell division to sound one octave below
their normal pitch when notes are played on the Swell manual. Likewise, activated Swell
stops will sound one octave higher than normal when both the
SWELL UNISON OFF and
SWELL TO SWELL 4’ coupler are activated.