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A reed pipe comprises a metal tongue (the reed) which rests against a shallot, in which is carved a tunnel. The reed and shallot are held in place by a wooden wedge. This assembly protrudes from the underside of the block and hangs down into the boot. A tuning wire is inserted through the boot and is bent to hold the reed against the shallot.
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.
On a slotted metal pipe, some or all of the metal cut out to make the slot is rolled up so the slot can effectively be shortened or lengthened, thus changing the pitch of the pipe. On a slotted wooden pipe, a wooden slider is provided to shorten or lengthen the slot. A stopped pipe (wood or metal) is usually tuned by moving its stopper up or down.
Reed A reed stop at 8 ft pitch on the manuals with a tone similar to that of a bassoon. Dulciana Dulziana String An 8 ft pitch metal string stop. Usually the softest stop on an organ. Fagotto (Italian) Fagot (Dutch) Fagott (German) Bassoon (English) Basson (French) Reed: A 16 ft or 8 ft pitch chorus reed.
Ophicleide (/ ˈ ɒ f ɪ k l aɪ d / OFF-ih-klyde) and Contra Ophicleide are powerful pipe organ reed pipes used as organ stops. The name comes from the early brass instrument, the ophicleide, forerunner of the euphonium. The Ophicleide is generally at 16 ft pitch, and the Contra Ophicleide at 32 ft.
The scaling of a pipe is a major influence on its timbre. Reed pipes are scaled according to different formulas than for flue pipes. In general, the larger the diameter of a given pipe at a given pitch, the fuller and more fundamental the sound becomes.
A hand-pumped Indian harmonium, of the type used in South Asia, here used at a European jazz festival.. The pump organ or reed organ is a type of organ using free-reeds that generates sound as air flows past the free-reeds, the vibrating pieces of thin metal in a frame.
The pitch of a single bank of reeds is traditionally defined in a similar manner to the organ stops of a pipe organ.A bank that sounds at unison pitch when keys are depressed is called 8′ (pronounced "eight-foot") pitch: alluding to the length of the lowest-sounding organ pipe in that rank, which is approximately eight feet.
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