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An organ stop can be one of three things: the control on an organ console that selects a particular sound; the row of organ pipes used to create a particular sound, more appropriately known as a rank; the sound itself; Organ stops are sorted into four major types: principal, string, reed, and flute.
The organ at the Naval Academy Chapel has 522 stops. The pitch produced by an organ pipe is a function of its length. All else equal, longer pipes produce lower-pitched notes, and shorter pipes are higher in pitch. An organ stop uses a set (rank) of pipes of graduated lengths to produce the range of notes needed.
An organ contains two actions, or systems of moving parts: the keys, and the stops. The key action causes wind to be admitted into an organ pipe while a key is depressed. The stop action causes a rank of pipes to be engaged (i.e. playable by the keys) while a stop is in its "on" position.
A mixture is an organ stop, usually of principal tone quality, that contains multiple ranks of pipes including at least one mutation stop. It is designed to be drawn with a combination of stops that forms a complete chorus, for example, principals of 8 foot (8 ′), 4 ′, and 2 ′ pitches.
376 stops; 464 ranks; 28,750 pipes; The largest pipe organ in the world, based on number of ranks and physical mass weight. It ranks second in the world based on number of pipes. It is the largest fully operational musical instrument in the world, with the weight of 287 tons.
The largest single stop in the organ by number of pipes, it contains 11 ranks totaling 803 pipes - roughly 2.5% of the entire organ. The stop is spread across two chests, and speaks on 20" wind pressure. It was fully restored and brought back on line in 2023.
Registration is the technique of choosing and combining the stops of a pipe organ in order to produce a particular sound. Registration can also refer to a particular combination of stops, which may be recalled through combination action .
In a rank of stopped pipes, the lowest pipe is 4 feet in length but sounds at unison pitch—that is, at the same pitch as an 8 ′ open pipe—so it is known as an 8 ′ stop. Reed pipes are also labeled the same as that of an open pipe with the same pitch, regardless of the actual length of the pipe.
Unification and extension give the theatre organ its unique flexibility. A rank is extended by adding pipes above and below the original pitch, allowing the organist to play that rank at various pitches by selecting separate stop tabs. By way of example, consider an organ where the Tibia Clausa rank at 8' (standard) pitch has 61 pipes. A ...
Gedackt is a stopped pipe, as its name implies. Stopped pipes need be only 1/2 of unison length to produce unison pitch, however, it is common for many stopped ranks of pipes to be built as "open" pipes in the highest sounding notes.