A combination action is a system designed to capture specific organ registrations to be recalled instantaneously by the player while he is playing. Because of this, it is also referred to as a capture system. It usually consists of several numbered pistons (buttons) situated in the space between the manuals at the organ console. The pistons control either the stops of the whole organ (in which case they are called general pistons or generals) or the stops of a particular division (in which case they are called divisional pistons or divisionals). Each piston is programmed by the organist with a particular registration to be activated when it is pressed. This allows the organist to change registrations on the fly, without the assistance of a registrant.
Read more about Combination Action: Sequencers
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