Rodgers Trillium T787, Owner'S Manual

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There are five divisional pistons for the Great and Swell; these pistons are numbered 1 to 5
and are located under the corresponding manual. For example, Great divisional pistons are
located underneath the Great manual near the middle of the keyboard, and Swell divisional
pistons are under the Swell manual.
Pedal divisional pistons are thumb pistons to the right of the Great divisional pistons
numbered 1 to 5.
General pistons are commonly used to make changes which affect the entire instrument. Use
these pistons when you want to affect all stops and couplers with a single control.
Divisional pistons work well when you want to affect only a single division. For example, if
you want to change stops in the Swell without affecting the rest of the instrument, you could
use a Swell divisional to change only the Swell registration.
Refer to Figure 2 for the location of general and divisional pistons.
Figure 2. Piston Locations.