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An 8 ′ stop is said to sound at "unison pitch": the keys on the organ console produce the expected pitch (e.g. the key for middle C causes a middle C pipe to speak), like a piano. 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 ...
The pipe organ is a musical instrument that produces sound by driving pressurised air (called wind) through the organ pipes selected from a keyboard.Because each pipe produces a single pitch, the pipes are provided in sets called ranks, each of which has a common timbre, volume, and construction throughout the keyboard compass.
The mouth has a high cut-up (height to width ratio) to produce the fluty tone. 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.
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. This is a sortable list of names that may be found associated with electronic and pipe organ stops. Countless stops have been designed over the ...
It ranks second in the world based on number of pipes. [11] It is the largest fully operational musical instrument in the world, with the weight of 287 tons. This concert organ was initially constructed for the 1904 World's Fair in St. Louis ; it was designed by George Ashdown Audsley .
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.
For example, an 8′ Gedeckt may also be made available as a 4′ Gedeckt, either on the same or a different manual. When both of these stops are selected and a key (for example, C 3) is pressed, two pipes of the same rank will sound: the pipe normally corresponding to the key played (C 3), and the pipe one octave above that (C 4).
In some larger organs, a second Tibia rank may be present, extended to 1 ft (0.30 m) instead of 16 ft (4.9 m), allowing a 1 + 1 ⁄ 3 ft (0.41 m) Nineteenth mutation and a 1 ft (0.30 m) Piccolo to be drawn from this rank. A few of the largest theatre organs, and some church organs, may have a separate 32 ft (9.8 m) Tibia Clausa rank of 12 pipes.