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One differentiates between free and firm combinations. Cancel buttons, non-return valves and introduction footsteps can have similar effects as firm combinations, are however own forms of registration assistance.
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free combinations are selectable by the organists ad libitum. There are two designs:
classical free combination
also German combination. With each Registerzug some small switches, mostly different color, per one are a combination. In addition, usually 3 or 4 combinations are usual, it quite give remarks up to 8 and more combinations.
also American combination. By means of a setting button a registration selected by hand registers is put down on a certain storage location. In this way up to several hundreds registrations can be stored. Isolated also typesetter plants with a floppy disk drive are used, in order to secure the combinations durably.
These are callable by tracers or Fusspistons over a sequencer (beep-switch). This is a pair of tracers (in each case a tracer for „forward “and „backwards “), with which will go through a before specified consequence of registrations can. Frequently still another further pair is intended for operation with the foot to such a pair of tracers for manual control.
Typesetter combination were in former times electrical and are nowadays electronically built. There were also mechanical typesetters.
of celebrations combinations or also collective course or group course mentioned are combinations, which of organ farmer was specified. If it concerns an electrical Registertraktur, these can be changed however quite also by technically experienced organists. Usual fixed combinations are dynamic gradations as „pp “, „p “, „mf “, „f “and „FF “.
cancel buttons permit on and a turning of individual groups of registers (tongue cancel buttons) of all registers (general cancel buttons off). The cancel button affects itself even if an appropriate register is registered (by hand or by a combination or the Registerschweller). Possesses a general cancel button today each organ with electrical Registertraktur.
of non-return valves in organs serve individual partial works completely switch on and off. In larger organs are often two separate pedal works, from which contains the louder registers and the other one the quieter registers. Over two non-return valves both pedal works can be turned on to the pedal. Thus a fast volume and tone quality change without pedantic Umregistrieren are possible. Particularly in the baroque organs on the iberischen peninsula are often more partial works than manuals present. Here the partial works are turned on over non-return valves as required to the existing manuals. In connection with with these instruments usual the loop division with c'/cis' even einmanualige organs offer a partially unusually large tone quality wealth and permit thus an accordingly sound-variable play. In the today's time the non-return valves with the arising of electronic typesetters at meaning lose.
switching just like the non-return valves determined groups of registers on and off. These are grouped however not as own partial works understood to separate according to their function. Such mechanisms were common in France and Italy.
the firm combinations has its history and origin in the pneumatic Registertraktur and today with exception of the tongue and general cancel button is not any longer built.