Coupling (organ)

See also: Coupling

In a Organ, the accessory which one names coupling is the mechanism which makes it possible to make simultaneously play the keys of several keyboards by touching some one.

For example, to make play the keyboard of Account starting from the keyboard of Large Organ, one " accouple" two keyboards, generally using a piston or of a spoon which engages a system which can be mechanical, pneumatic or electromagnetic. Once the engaged coupling, the organist can play on only one of these keyboard (the keyboard controls) while making hear the plays of the two keyboards at the same time. It is the coupling which retransmet with identical on the keyboard coupled (the Récit) what the organist plays on the pilot keyboard (the Grand Organ).

The coupling is not a reciprocal mechanism. So in our example the Grand Organ makes it possible to play the keys of the Récit, the Récit does not make it possible to control the Grand Organ.

Generally the coupling is into 8 ', i.e. the height is respected (in the caused case: C 1 inserted of GO draws C 1 from Account) but one can to find, from Cavaillé-coll, of couplings into 16 ' and into 4 ', also called precisely octaves serious and octaves acute , in particular with Account on itself (i.e. by inserting C 2, one plays actually C 1 and Do3) and of the Account on the GO. This system tends to becoming automatic on the modern organ .

The coupling of the keyboards on the pedals names Tirasse.

Coupling (organ)

Related articles