It is impossible to talk about the organ without using alot of language
that may be unfamiliar to you. This glossary should be helpful. If an unfamiliar
word does not appear here, just send me the term to me and I'll add it
to this list. My email address is pipeorgan@ibiblio.org.
A-B C-D E-G
K-M P R S
T-Z
A-B
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Air Chamber
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See the term wind chest.
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Articulate
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1. Sight separations are made before notes in this style of playing. The
organist decides the length of the separation and which notes to separate.
An entire technique has evolved around this principle and is used in playing
early organ music up through J.S. Bach and G.F. Handel.
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2. Articulate can also describe a type of stop that has a clear attack
point or chiff.
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Attack Point
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The moment at which the pipe begins to speak,
when the key is pressed, is the attack point. Different kinds of pipes
have a variety of attack points ranging from soft to strong and clear.
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Bellows
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In older organs, before electricity, this was used to pump air into the
reservoir. It was made of two wedge shaped pieces
of wood joined by an expandable, fan-like piece of leather. Closing the
bellows forced air into the Reservoir.
C-D
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Chiff
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Pipes that have a clear edge to the sound are often described as having
"chiff." Any kind of pipe can have chiff but principals almost always have
this clear attack point.
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Circuit
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An electrical connection which, when charged, it magnetizes a piece of
metal. This circuit is involved in the mechanism which opens the valves
to allow pipes to speak in an electric action
instrument.
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Combination Action
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The type of mechanism which controls the work of the pistons.
One kind of mechanism is digital.
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Console
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The unit that contains everything the organist needs to control the sound
such as the manuals, pedalboard,
pistons, etc. All this stuff together is the console.
For a picture, see the overview page.
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Coupler
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A coupler allows one division to be connected to another. This allows the
stops of two divisions to be controlled by one manual or the pedals. For
example, the Swell to Great coupler allows the Great manual to use stops
from the Swell. There are also couplers which act within a division to
play the stops at a different octave. For example, SW 4' is a coupler which
will play the stops in the swell up an octave and at regular pitch at the
same time.
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Divisional Piston
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It is a piston that affects only one division
(See the next term). Each division on the organ will have sets of pistons
that work only on that particular division.
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Division
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The pipes are grouped into several separate sections called divisions.
Each one has a name and is controlled through it's own manual or the pedalboard.
There are several manual divisions and the most common are: Great, Swell,
and Choir or Positive. There is only one Pedal division.
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Drawknobs
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These turn the different kinds of pipe sounds on or off. Pulling the knob
out turns the stop on and pushing it in turns it off.
Some builders use stop tabs which flip up and down in place of drawknobs.
E-G
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Electric Key Action
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In an electric key action, a wire, an electrical circuit
and an electro magnet cause the valve
below each pipe to open and close. When you press the key, you close an
electrical contact. Electricity flows to the circuit which causes an electro-magnet
to open and close the valves under each pipe.
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Electro-Magnet
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This is a piece of metal which, when magnetized by an electrical
circuit, attracts the valve below the pipe. The
valve opens and air flows through the pipe, making the pipe speak.
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Flue Pipe
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This kind of pipe can be made of metal or wood. The sound is produced when
the wind flows through the foot of the pipe and flows out the mouth (the
hole in the front of the pipe). The air hits the lip of the pipe and causes
the column of air to vibrate. The length of this column of air which, in
turn, determines the pitch of the sound. The pipe's length determines the
size of the air column. For a diagram of a flue pipe, see the sound
characteristics page. Most of the pipes on the organ are flue pipes.
The others are reed pipes. There are several types
of flue pipes: Principals, Flutes, and Strings.
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General Piston
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This piston affects entire organ and is used to recall the organist's choice
of stops and couplers from all
divisions of the organ.
K-M
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Key Action
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This is the mechanism the keyboard uses to used to control the pipe speech.
It does this by controlling the air flow to the pipes. For more information,
see How the Sound Is Produced. There
are two kinds of key action: Mechanical Action
and Electric Key Action.
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Legato
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1. In this style of organ playing, the notes flow smoothly from one to
the next. Sometimes there are breaks between notes for musical phrases
or to accentuate a note but the overall effect is smooth when compared
to the articulate playing of the Baroque.
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2. Legato can also refer to the kind of technique
needed to play the notes smoothly.
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Manuals
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This is the organ term for the keyboards.
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Mechanical Action
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The key is connected to trackers which eventually
connect to the valves that open to admit air from
the wind chest into the pipe. When you press
the key, you are physically opening the valve in the wind chest. In mechanical
action, there is one valve for each note on the keyboard. So, if the organ
has 10 stops, there is one valve for all ten pipes which correspond to
that note on the keyboard.
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Memory Levels
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In digitally controlled combination action, a memory level is like a file.
Multiple level are essentially multiple files, allowing several different
possibilities for one piston. See Solid
State Combination Action.
P
Return to Beginning
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Pallet or Pallet Valve
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When air flows to the pipe, it goes through a hole in the wind chest beneath
the pipe. The pallet valve closes this hole when the pipe is not being
used. Pressing the key will open this valve. Pipe valve is also another
term.
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Pedalboard
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This is the structure on the floor which contains the pedals and mechanisms
which link them to the rest of the organ.
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Pipe Beard
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Used only in flue pipes, this is a metal rod that
extends in front of the mouth and is connected to the ears. Large pipes
need this extra piece to focus the tone because the larger mouth in these
pipes makes the tone unstable.
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Pipe Toe
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This is the bottom opening of the pipe which rests in a hole on the top
of the wind chest. See this page for
a diagram of a pipe.
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Pistons
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A piston is one of the numbered thumb buttons
or toe studs on the console which can memorize
a combination of stops. The organist can choose the
stops to use by turning them on and then set them on one of the numbered
pistons. (Most organ consoles have a Set button on the lower left corner
of the bottom manual which is used for this purpose.) Then, the organist
can recall those stops at any time by pressing that piston. There are general
and divisional pistons.
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Pitch
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Pitch in music is the note that sounds. On the organ, pitch does not always
correspond to the key which plays the pitch. For more information on pitch
and organs, see the Pitch Levels page.
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Pluck Point
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In mechanical action, this is the point
at which the tracker is pulling the valve open.
The organist can actually feel this through the key. It is similar to the
pluck point in a harpsichord, which the musician can also feel when pressing
a key.
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Principal
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A principal is one family of sound. It is a flue pipe
which is rather narrow for its length and produces a bright, clear sound.
There are many kinds of principals.
R
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Rank
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A rank is a row of pipes. The row always has all pipes of the same kind
of sound. For example, all the pipes for a Spitzflute (one kind of flute
sound) will be in the same row. Organs are often described by the number
of ranks they have. A 60 rank instrument is a fairly large size while an
18 rank instrument is small. Practice organs can have anywhere from 3 to
9 ranks.
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Reed Pipe
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This pipe is alot like a single reed orchestral instrument. The wind flowing
through the pipe vibrates a metal tongue, a strip of flat metal, against
an open-faced shallot. This is not visible from the outside because these
parts are contained in the boot, the bottom part of the pipe which rests
on the wind chest. The sound is amplified by the resonator, the top, flared
part of the pipe. Pitch is determined by the length of the tongue. They
have a strong, penetrating tone. ( Ritchie
and Stauffer ) For a diagram, see the sound
characteristics page.
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Reservoir
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This is a storage container for the wind. The top part of the container
is expandable, like a fan or accordian. Weights or springs are used on
the expandable part to keep the air under pressure. If the wind going to
the pipes is not under the same, constant pressure, the sound will waver
and the note will warble.
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Reversibles
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These are a convenience item and each one has only one function. Pressing
the stud reverses what the current status of the stud was. If it was off,
it is now on and vice versa. An example is a 32' Bourdon. This turns that
stop on or off. Other examples are Full Organ which turns on all stops
of the organ without the knobs or tabs physically moving, and Great to
Pedal which is a foot control of the coupler.
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Roller
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In mechanical action, the keys are directly
in front of the pipes and wind chest so the connection between the key
and valve follows straight lines and right angles. Sometimes the architecture
and space available necessitate the placing of the pipes off to the side.
Then the connection must follow straight lines at irregular angles.
The roller, a wooden rod, is used in this circumstance as its
rotation can accommodate the irregular angles. It has two arms at each
end. One is attached to the key (or pedal) and the other is attached to
the valve directly, or trackers which lead to the
valve. The roller mechanism is frequently used in the pedal division and
is only found in mechanical action instruments.
S
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Scaling
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This is the proportion of the width of a pipe to its length. Tone quality
of the pipe will change as the proportion changes.
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Slider
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This is a long wooden slat which has holes in it that correspond to a rows
of holes in the top of the wind chest. It is used in a slider wind chest
(see the next term).
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Slider Chest
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This type of wind chest uses a slider to block the
holes in the wind chest and prevent the pipes from speaking. For a more
detailed description, see How the Sound
Is Produced.
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Speaking Pipes, Pipe Speech
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This is organ slang that means the pipe is making a sound.
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Solid State Combination
Action
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This is a new technology that allows the memory of the pistons to be digitally
memorized. There are multiple digital memory banks available up to 128
levels, depending on what the builder has installed. This means all the
pistons can be "re-memorized" on multiple levels. For example, if the organ
has 10 General Pistons and 32 levels of memory,
there are 32 possibilities for GP #1, GP#2, and so on. The total possibilities
for the general pistons are 32 x 10 or 320. These memory levels affect
all pistons, generals and divisional pistons.
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Staccato
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When notes are played short and detached, they are staccato.
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Stop
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1. The knob or tab which is used to turn a type of sound on or off (see
Drawknobs).
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2. A type of sound available on the organ. It usually has one pipe per
note, although some kinds of sounds use several pipes for one note on the
keyboard. Many stops on an organ result in many possibilities for tonal
color and volume. There are several families, or groups, of sounds: Reeds,
Principals, Flutes, and Strings.
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Stop Action
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This mechanism turns the stops on and off through the use of drawknobs
on the sides of the console or stop tabs above the manuals.
In turning a stop on, a barrier between the pipes and wind chest is moved
aside so that air can flow to the pipe when its corresponding key is pressed.
For more detailed information, see How the
Sound Is Produced.
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Stop Tabs
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See Drawknobs.
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Swell Pedal or Swell Shoe
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A pedal on the console that controls the opening and closing of the swell
shades.
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Swell Shades
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Slats which look like Venetian blinds that can be opened and closed through
a foot pedal called the swell shoe. This allows volume control because
pipes behind the blinds will get louder as the shades are opened. The shades
are normally in front of the division called the swell. They can also be
placed in front of the solo and choir divisions if the organ has these
divisions.
T-Z
Return to Beginning
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Technique
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Technique in playing an instrument refers to all the physical movements
and mental knowledge needed to play the instrument. All of these things
are factual knowledge and can be taught to anyone. This is in contrast
to artistry, which cannot be taught. Good technique is important because
it helps the musician to express his or her artistic ideas. Organ repertoire
uses two main types of technique: Legato and Articulated
Playing.
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Thumb Pistons
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Just below the keys of each manual are small buttons. The numbered ones
are pistons. The others have various functions and
are reversibles. The thumb is used to press
them which is how they got their name.
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Tone
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Tone is the color of the sound. The organ has a wide variety of sounds
available. The difference in the sound colors of the stops makes this variety
possible.
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Toe Studs
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These are the large buttons on the console near
the pedals that control several mechanisms on the organ. On the right,
there are a group of divisional toe pistons
that only memorize stops for the pedal division.
The group on the left is the general pistons
which affect all stops and couplers on the organ. These are repeats of
the thumb generals below the manuals. The last kind of toe studs you will
see are called reversibles. These are usually
spread out across the bottom of the console, above the generals and pedal
divisionals. These are a convenience item and has only one function per
stud.
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Tracker
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1. Another name for mechanical action.
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2. A tracker is also a long thin piece of wood used in mechanical action
instruments to open the valve (See next term).
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Valve
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These open or close to admit air to the pipe. Their movement is controlled
through the keys on the keyboard. Pressing a key down pulls the valve open.
Each key has a spring underneath it so that the key returns to the "up"
position, allowing the valve to close.
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Voicing, Voiced
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All pipes in a organ are altered after the organ is installed because acoustics
of the room affect the organ's sound. Tonal color, volume, and stability
of sound are affected by these alterations. For example, an unusually loud
pipe that sticks out above the rest is softened until its volume matches
the other pipes of that stop. Pipe organs are intentionally voiced for
the following characteristics: Each note will sound slightly different
in character, and the overall volume will increase as the notes go up the
scale.
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Wind Chest
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The pipes sit atop this plain wooden box. When a stop
is on, air flows from the reservoir into the box.
When notes are played, it uses the air from this box to make the pipes
speak.
This site is part of the Organ Education Project. ©
Copyright 1996 by Marya J. Fancey