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Registration
On a pipe organ, the sound of a rank of pipes is switched on or off with stops. By varying
the stops, an organist can add dynamic and other nuances. This means that some
knowledge of the traditional pipe organ is necessary to be able to registrate. Organists will
have to be acquainted with the timbres of the different stops. Hence this short note about
the types of organ stops.
The various stop names usually show the footage, e.g. 8 feet. This means that the tallest
pipe (great octave-C) of this open stop measures 8 feet (about 243 cm). A stop with the
indication 16 feet (486cm) sounds an octave lower.
Organ pipes can be divided into two main groups:
! labials
! reeds
Flues
The principle of tone generation with flues is the same as with the recorder. Flues occur
in two versions: open or (semi) stopped. An example of a semi-stopped pipe is the
Rohrflute. On the lid an (open) pipe (rohr) has been soldered. An example of an open flue
is the Principal. The pipes of this stop are usually placed in the front of a pipe organ. Flue
stops can be subdivided into the following families:
Principals
Prestant, Octave, Quint, Super Octave, Mixture, Scharff, Cymbel, Rauschpfeife and
Sesquialtera, belong to the family of principals. These last five stops activates several
pipes (of different pitch) per key. They are called mixtures (compounds).
Flues
Among others, Hohlflöte, Gedackt, Bourdon, Subbass, Nasard, Spitzflöte, Gemshorn and
Rohrflute, belong to the flute stops, both open and stopped, metal or wooden.
Strings
The string stops such as: Viola di Gamba and Salicional belong to the family of the narrow-
scaled, open labial pipes.
Reeds
In reeds the wind is driven through the foot-hole into the shallot; this causes the reed to
vibrate. This vibration is amplified and 'coloured' by the air column into the 'resonator''. The
Bassoon, Trumpet, Schalmey, etc. belong to the reeds with a long funnel-shaped
resonator. Fagotto, Dulciana, Krummhorn, etc. belong to the group with a cylindrical
resonator. Regal, Vox Humana and Rankett belong to the group with a short resonator, etc.
User's Manual
JOHANNUS
JOHANNUS
JOHANNUS
JOHANNUS
66
Monarke
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