Direct electric action is a systems used inpipe organs to control the flow of air (wind) into the organ's pipes when the corresponding keys or pedals are depressed. In direct electric action, the valves beneath the pipes are opened directly byelectro-magnetsolenoids, while withelectro-pneumatic action, the electro-magnet's action admits air into a pneumatic or small bellows which in turn operates the pipe's valve.
Other types of actions used in pipe organs aretracker action, using mechanical linkage of rods and levers, andtubular-pneumatic action which utilizes a change of pressure within lead tubing which connects the key to the valve pneumatic.
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