Pull a full chorus of stops on the Great:
Pull a complementary chorus of Pedal stops:
While playing a chord on the Great, close and open the expression pedal directly over the center-most pedal notes E and F. Do you hear a volume change? If not, the volume of the Great is not controlled by that pedal. If there is no other expression pedal, the Great is exposed.
Now repeat this procedure while playing a pedal note. If its volume remains unchanged, the Pedal division is also exposed.
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