Another kind of non-speaking stop is the TREMULANT.
Cancel, then pull the following stop combination:
Play a C chord on the Great in the left hand, a C in the Pedal, and a slow C scale in the right hand on the Swell. If ONLY the Swell stop is affected by the tremulant, your organ has a DIVISIONAL tremulant. If ALL stops are affected, then the tremulant is not divisional but GENERAL, and will probably be used less frequently.
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