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An organ stop is a component of a pipe organ that admits pressurized air (known as wind) to a set of organ pipes. Its name comes from the fact that stops can be used selectively by the organist; each can be "on" (admitting the passage of air to certain pipes), or "off" ( stopping the passage of air to certain pipes).
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 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.
These controls are generally either draw knobs (or stop knobs), which engage the stops when pulled out from the console; stop tablets (or tilting tablets) which are hinged at their far end; or rocker-tablets, which rock up and down on a central axle.
There are no pistons or toe studs. The combination action consists of six stop knobs, one for each division of the organ, connected to a system of pneumatics. When one of these knobs is pulled, the registration on its respective division may be altered without the stop changes taking effect.
Bourdon, bordun, or bordone normally denotes a stopped flute type of flue pipe in an organ characterized by a dark tone, strong in fundamental, with a quint transient but relatively little overtone development. Its half-length construction makes it especially well suited to low pitches, and economical as well.