Pipe-Organ Manuals, Pedalboards, and Divisions Explained

A manual is a keyboard played by the hands, and it plays a division: a section of the organ made up of one or more windchests with their pipes, whose ranks are made and voiced to be used together in combination. One builder describes the division heading in a specification as carrying two things at once, an assignment to a manual or to the pedalboard and a physical grouping of that division’s pipes in a chamber or a section of the case, although a division can in practice be split across two chests, so the grouping is not always in one place.

The keys themselves are not velocity sensitive, and a held note does not decay, so how hard a key is struck does not change the volume and the note continues for as long as the key is held. That description covers the sounding of a single rank and says nothing about the attack a particular key action produces. Which ranks are drawn, and on an enclosed division the position of its shades, belong to the stop controls and expression shoes pages.

On a two-manual American console the Great is conventionally the lower manual and the Swell the upper, and that is a convention rather than a rule: division naming and order differ by national tradition and by individual instrument. When an American console gains a third manual, the usual arrangement places the new Choir or Positiv manual below the Great, so the Choir becomes the first manual, the Great the second, and the Swell the third. Larger instruments and continental ones order their divisions differently.

British practice, as taught on one practitioner resource for amateur organists, names the manuals Swell and Great from top to bottom on a two-manual instrument and Swell, Great, and Choir from top to bottom on a three-manual one. That is a teaching convention rather than an institutional standard, and knowing the name of a manual does not tell you what ranks its division contains.

The AGO console specifications give the manual compass as CC to c4, 61 notes, and that document is a voluntary recommendation, not a binding standard; instruments of other traditions and historic instruments commonly use other compasses. The same count has an older British pedigree: the Royal College of Organists recommendations of 1881, as restated in 1903, called for five octaves, CC to C, 61 notes, but that was a proposal published in a music magazine and establishes what was recommended, not what British builders went on to build.

The Organ Historical Society describes the standard American manual as having 61 keys while noting that 56-note and 58-note manuals were more common in 1998 than they had been in 1950. That is an observation of a trend at one date, not a census of the instruments standing today, so a manual with fewer than 61 keys is neither rare nor a sign of anything amiss.

The recommendation is meant to be set aside on purpose in some cases. The Guidelines for Fine Organbuilding published by the American Institute of Organbuilders, issued in January 1994 and reprinted in 2020, recommend that console layout generally follow the AGO recommendations except for historic restorations, strict historical reproductions, and instruments emulating a historical style; the guidelines describe practices in use among builders rather than mandating them. Dimensions taken from these documents are therefore conventions, not universal rules, and a console that departs from them may be following a different tradition deliberately.

For consoles with non-standard keyboard compasses, the same AIO guidelines recommend placing manual D27 above pedal D15 so that the relationship between the hands and the feet stays consistent. That guidance fixes one alignment reference point only and does not prescribe any other dimension.

The pedalboard is the keyboard played by the feet, and it stands in the same relation to the Pedal division as a manual does to its own division. Under the AGO recommendation its compass is 32 notes, CCC to G, but that figure is a recommendation: 30-note and shorter pedal compasses remain in use, and suppliers still catalog 30-note pedalboards.

Radiating means the pedal keys are spaced more widely at the player’s end than at the back, and concave means the keys at the ends of the compass sit higher than those at the center. The two terms describe two independent properties with separate tolerances, so a pedalboard can be radiating without being concave and concave without being radiating, and neither term is itself a dimension.

The AGO specifications set the radiating radius at 8 feet 6 inches, with 8 feet 6 inches as the minimum and 9 feet 6 inches as the maximum, and set the concavity radius at 8 feet 6 inches, with 8 feet 6 inches as the maximum and 7 feet 6 inches as the minimum. The Royal College of Organists recommendation of 1881, as restated in 1903, called for a concave and radiating pedalboard with a radius of eight feet measured from a central point to the back of the pedal sharps. Those two radii are measured to different reference points, so they are not interchangeable and one cannot be read as a correction of the other; each stands within its own tradition, the American figure as a voluntary recommendation and the British figure as a nineteenth-century proposal.

The AGO sheet also specifies the playing surface as 27 inches between heelboard and toeboard, the center-to-center distance of adjacent naturals at the sharp key fronts as 2.5 inches, giving an octave of 17.5 inches, and the pedal touch as half an inch of depth at the sharp key front line with a weight of 2.5 to 3 pounds. Those figures explain how pedal geometry and touch are specified in that document; they are recommended values, not a description of what any given console must have.

A flat, parallel pedalboard is evidence consistent with an older or a historically styled instrument, but by itself it does not date a console. The Organ Historical Society stated in 1998 that radiating concave pedalboards are the standard pedalboards built in the United States and that straight flat pedalboards appear in older instruments, which is a prevalence statement for American practice at that date rather than a rule about any single instrument. One trade supplier states that it builds pedalboards to AGO specifications in both 30-note and 32-note compass, which is that company’s description of its own catalog.

A division is a section of the organ played from a single manual or pedal keyboard, and the familiar names describe roles that are conventional rather than fixed. In the Organ Historical Society’s teaching account the Great is the main manual division, containing principals, flutes, and often reeds; it is rarely enclosed, and its pipes often stand visible in the case or facade. That is common practice rather than a rule, since at least one builder publishes instruments in which the Great is wholly or partly enclosed.

The Swell is conventionally the enclosed manual division, its pipes standing in a wooden box fitted with adjustable louvers or shades, and it typically carries softer flues, strings, and reeds; enclosure matters here as a property of the division that changes which tonal resources are usable, and the shade hardware belongs to the expression page. The Choir is conventionally enclosed, softer than the Great, and used for accompaniment, and the teaching account derives its name from the older Chair organ placed behind the player, an etymology given by that source rather than one drawn from a period document. The Positiv complements the Great, is quieter and pitched higher, and is typically unenclosed unless the specification names an Expressive Positiv; that describes common modern American practice, and historical Rueckpositiv and Positif divisions differ in placement and content.

Echo and Antiphonal divisions are defined by remote placement rather than by tonal family, the Echo carrying quiet ranks at a distance and the Antiphonal typically standing at the opposite end of the building from the main organ. Because placement is what makes these divisions what they are, a stoplist that omits their location omits the defining fact.

A floating division has no keyboard of its own and is played only by being coupled to another keyboard. A coupler is a console control that makes a division sound from another keyboard or at another octave. For a floating division, coupling connects the division to a keyboard so its drawn ranks can sound there; its resources are therefore unavailable unless at least one coupler is engaged, which makes the coupler list part of the instrument’s effective stoplist. The keyboard-to-division relationship is not always one to one, then: a keyboard may play its own division plus a coupled one, and a division may have no keyboard at all until a coupler supplies it.

A division name in a stoplist does not establish a single physical location. A single division may be split across two windchests, commonly a C side and a C-sharp side, so that one named division occupies two places; how those chests admit wind to the pipes is a windchest subject and not part of this page. One builder describes a well-formed specification as marking which divisions are enclosed with swell shades and which are unenclosed, alongside stop names, pitch designations, Roman numerals for rank counts, and division headers, while noting that many published historical stoplists omit those markings. The stop controls on the console are the reader’s other map of the divisions; how drawknobs, tilting tablets, and rocker tabs show and request the state of each rank, and what their layout can establish, is covered on the stop controls page.

The French classical organ is organized into Grand Orgue, Positif, Recit, Echo, and Pedale, with the Recit and Echo often carrying only a few ranks and sometimes only treble-compass half stops. That is a historical description of a school of building and cannot establish what any surviving individual instrument contains today.

Under the German Werkprinzip each division is a self-contained Werk with its own windchest and spatial position, so Hauptwerk, Rueckpositiv, Brustwerk, Oberwerk, and Pedal are architectural categories as well as tonal ones. Werkprinzip is a descriptive category applied by later writers, and how far any individual historic instrument conforms to it has to be established instrument by instrument.

Theatre organs use a different manual naming scheme from church organs, running Accompaniment, Great, and Solo on three manuals and Accompaniment, Great, Orchestral, Bombarde, and Solo on five, and the same division names on a church organ would not carry the same meaning. In the geometry of the keyboards, though, the theatre console converges with classical convention: one regional society describes 61-note manuals whose keys have a receding front that lets them overhang the manual below, a flat bottom manual with the upper manuals usually tilted progressively toward the player, and a 32-note radiating concave pedalboard, with the tilted upper manuals described as usual rather than universal.

On an instrument of identified historic value, replacing an old pedalboard with one built to modern standards is something conservation guidance says should not happen: the New South Wales heritage conservation guide for pipe organs states exactly that, and its doctrine applies to instruments of historic value under that jurisdiction’s guidance rather than to ordinary modern consoles. The American organbuilders’ guidelines reach a compatible position from the other direction, recommending the AGO console layout generally while excepting historic restorations, strict historical reproductions, and instruments emulating a historical style.

For an owner who has inherited a console with a short compass, a flat pedalboard, or an unfamiliar manual order, the first question is whether the instrument has identified historic value, because that determination decides which guidance applies before any question of comfort or modern practice is reached. Recording the existing compass, keyboard order, and pedalboard geometry is part of documenting the instrument as it stands, and it is the starting point for any project that would change them.