Editing Pipe organ (section)

====Couplers====
A ''coupler'' allows the stops of one division to be played from the keyboard of another division. For example, a coupler labelled "Swell to Great" allows the stops drawn in the Swell division to be played on the Great manual. This coupler is a unison coupler, because it causes the pipes of the Swell division to sound at the same pitch as the keys played on the Great manual. Coupling allows stops from different divisions to be combined to create various tonal effects. It also allows every stop of the organ to be played simultaneously from one manual.<ref name="crumhorn">{{cite web|title=A brief tour of a pipe organ |publisher=Crumhorn Labs |url=http://www.crumhorn-labs.com/Documentation/CurrentUserGuide/HTML/HauptwerkInstallUserGuideFiles/TourOfAPipeOrgan.html |access-date=19 April 2008 |url-status=dead |archive-url=https://web.archive.org/web/20080410182430/http://www.crumhorn-labs.com/Documentation/CurrentUserGuide/HTML/HauptwerkInstallUserGuideFiles/TourOfAPipeOrgan.html |archive-date=10 April 2008 }}</ref>

''Octave couplers'', which add the pipes an octave above (super-octave) or below (sub-octave) each note that is played, may operate on one division only (for example, the Swell super octave, which adds the octave above what is played on the Swell to itself), or act as a coupler to another keyboard (for example, the Swell super-octave to Great, which adds to the Great manual the ranks of the Swell division an octave above what is played).<ref name="crumhorn"/>

In addition, larger organs may use ''[[unison]] off'' couplers, which prevent the stops pulled in a particular division from sounding at their normal pitch. These can be used in combination with octave couplers to create innovative aural effects, and can also be used to rearrange the order of the manuals to make specific pieces easier to play.<ref name="crumhorn"/>