In a previous post I mentioned that according to the German organ theorist Hans Klotz a minimum of 25 stops were required to enable an organist to perform chamber music as well as symphonic pieces.
I have since received several private requests to make Hans Klotz’s stop list available, so here follows the relevant extract from his oeuvre “The Organ Handbook” published in 1969 by Concordia Publishing House, 3558 S. Jefferson Avenue, St. Louis, Missouri 63118-3968.
Library of Congress catalogue Card No. 69-11068
In order for the stop list to make total sense, rather large chunks of “prelude” and “postlude” texts are required, so here goes:
The characteristic tonal palette of an organ is contingent upon the beauty, balance, and multiple usefulness of its mutations and reed stops. Mutations such as the Quinte, Terz, Nasat, Sesquialtera, Rauschpfeife, Terzian, Mixture, Scharf, and Zimbel, as well as reeds such as the Trompete, Posaune, Dulzian, Krummhorn, Barpfeife, zink, and Sordun, must blend well with all other stops. They must not sound so obtrusive as to be unusable in chamber music. If they are built as “fortissimo formants,” they become useless for the genuine art of registration.
We established earlier that the Hauptwerk and the large Positiv must be dynamically well balanced, so as to be on par; only then can the tonal resources of an organ be realized to the fullest. That does not mean, of course, that these two corpora should be composed of identical stops; rather, they should be made up of stops of equal dynamic strength but of different tone colour: contrast of colour but equality of dynamic level. The registration of preludes and fugues presupposes a quite different sound of the mixture plenum of the Hauptwerk versus that of the Positiv; when coupled, the two plena must produce yet a third new quality of sound. Contrast in dynamic level traditionally is furnished by the small Positiv, the Brustwerk.
Only the large Positiv is the logical division to be enclosed; such an arrangement is the only basis for a healthy dynamic conception, an only in this way does the organist have at his disposal artistically useful dynamic steps consisting of the three basic “forte” categories:
Mixture plenum (les pleins jeux)
Reed plenum (les grands jeux), and
Foundation stops (les grand fonds).
The dynamic proportions of the individual divisions must be so designed that the Hauptwerk and the Schwellwerk (enclosed division) with open shutters are equal; the small Positiv must rank dynamically a measured step above the closed Schwellwerk in the three aforementioned categories (but still below the Hauptwerk), but for chamber music of solo and ensemble nature, it must be on the same level with the Hauptwerk for the purpose of well-balanced duo and trio registrations. With such a design the organist is furnished the means for chamber music as well as symphonic playing; he has at his disposal simultaneously contrasting and characteristic tone colours as well as flexible dynamics.
More Rules for Specifications
The following rules apply to specific aspects of specification: Each of the three corpora – Hauptwerk, Schwellwerk, and Positiv – should contain the three aforementioned registrational categories – mixture plenum, reed plenum, and foundation stop ensemble; in addition, each must furnish solo possibilities for cantus firmus, duo, and trio registrations as well as accompanimental stops; the Pedal needs, in addition to the simple bass ranks, cantus firmus stops and a mixture for pedal solos. All of this can be achieved with a minimum of 25 stops, providing that correct scaling and voicing prevail; the example below illustrates this:
Hauptwerk:
Principal 8’
Octave 4’
Mixture IV 2’
Bourdon 16’
Gedackt 8’
Flöte 4’
Nachthorn III
Farbenzimbel II
Trompete 8’
Schwellwerk:
Principal 4’
Scharf VI 1 1/3’
Offenflöte 8’
Dulzian 16’
Trompete 8’
Viola da Gamba 8’
Positiv:
Principal 2’
Zimbel III 1’
Gedackt 8’
Flöte 4’
Krummhorn 8’ (French)
Pedal:
Offenbass 8’
Choralbass 4’
Rauschpfeife IV 2 2/3’
Subbass 16’
Posaune 8’
It will be noticed that our specification assigns considerably more stops to the Hauptwerk than to the other divisions. This is explained by the fact that those Positiv stops which constitute the mixture plenum are also usable for solo purposes, a feature not achievable by the corresponding Hauptwerk stops; thus the Hauptwerk and Positiv are the most important divisions for solo registrations, as the two lower keyboards lend themselves best to the difficult technique of trio playing.
It is important that the solo stops are distributed on Hauptwerk and Positiv in reasonably equal proportions. For a proper relationship of mixture and reed plena, trumpets and mixtures must be dynamically equivalent. Furthermore, the Krummhorn in combination with the Gedackt and flöte must yield a good accompanimental level for the Hauptwerk reed plenum; in turn, the Hauptwerk Principal must serve as accompanimental stop for the Krummhorn of the Positiv.
The Subbass, Offenbass, and Choralbass of the Pedal should adequately support the mixture and reed plena of the coupled manual divisions; at the same time, however, the Offenbass, alone or in combination with the Subbass, should furnish a good bass level for a trio registration. Incidentally, in this respect the pedal coupler of the unused manual division offers additional possibilities. The Choralbass should serve as a solid cantus firmus voice in trio textures; the Posaune 8’ must sustain a cantus firmus against the mixture plena of the coupled manual divisions.
The Schwellwerk is assigned to the top keyboard, the Hauptwerk to the middle keyboard, and the Positiv to the bottom keyboard; this arrangement facilitates the performance of Bach’s works, because the organ builders in Bach’s Saxony assigned the Oberpositiv to the top keyboard and the Brustwerk to the bottom keyboard. This, incidentally, corresponds to an extent with the contemporary English practice of assigning the Swell to the top, the Great to the middle and the Choir to the bottom keyboard.
The voicing of the individual stops must be precisely interrelated:
- The Gedackt must well sustain any other stop;
- c’’ of the Bourdon and c of the Flöte must correspond to c’ of the Gedackt;
- c’’’ of the Bourdon must correspond to the c’’ of the Gedackt, and so forth
- c of the Octave must correspond to the c’ of the Principal, and so forth.
- c’ of the Nachthorn (Kornett) must be related to the pipes g’’, c’’’, and e’’’ of the Gedackt
- the C of the Mixture must be related to the pipes c, g, c’, g’ of the Octave, and so forth.
Regarding the number of stops and pipes, the following distribution is recommended: the total number of stops should be compounded of 45% foundation (labial) stops, 35% labial stops of pitch levels above 4’, and 20% lingual stops. Half of the total number of stops should belong to the family of Principals.
Got it?
Gunnar Stenberg
I have since received several private requests to make Hans Klotz’s stop list available, so here follows the relevant extract from his oeuvre “The Organ Handbook” published in 1969 by Concordia Publishing House, 3558 S. Jefferson Avenue, St. Louis, Missouri 63118-3968.
Library of Congress catalogue Card No. 69-11068
In order for the stop list to make total sense, rather large chunks of “prelude” and “postlude” texts are required, so here goes:
The characteristic tonal palette of an organ is contingent upon the beauty, balance, and multiple usefulness of its mutations and reed stops. Mutations such as the Quinte, Terz, Nasat, Sesquialtera, Rauschpfeife, Terzian, Mixture, Scharf, and Zimbel, as well as reeds such as the Trompete, Posaune, Dulzian, Krummhorn, Barpfeife, zink, and Sordun, must blend well with all other stops. They must not sound so obtrusive as to be unusable in chamber music. If they are built as “fortissimo formants,” they become useless for the genuine art of registration.
We established earlier that the Hauptwerk and the large Positiv must be dynamically well balanced, so as to be on par; only then can the tonal resources of an organ be realized to the fullest. That does not mean, of course, that these two corpora should be composed of identical stops; rather, they should be made up of stops of equal dynamic strength but of different tone colour: contrast of colour but equality of dynamic level. The registration of preludes and fugues presupposes a quite different sound of the mixture plenum of the Hauptwerk versus that of the Positiv; when coupled, the two plena must produce yet a third new quality of sound. Contrast in dynamic level traditionally is furnished by the small Positiv, the Brustwerk.
Only the large Positiv is the logical division to be enclosed; such an arrangement is the only basis for a healthy dynamic conception, an only in this way does the organist have at his disposal artistically useful dynamic steps consisting of the three basic “forte” categories:
Mixture plenum (les pleins jeux)
Reed plenum (les grands jeux), and
Foundation stops (les grand fonds).
The dynamic proportions of the individual divisions must be so designed that the Hauptwerk and the Schwellwerk (enclosed division) with open shutters are equal; the small Positiv must rank dynamically a measured step above the closed Schwellwerk in the three aforementioned categories (but still below the Hauptwerk), but for chamber music of solo and ensemble nature, it must be on the same level with the Hauptwerk for the purpose of well-balanced duo and trio registrations. With such a design the organist is furnished the means for chamber music as well as symphonic playing; he has at his disposal simultaneously contrasting and characteristic tone colours as well as flexible dynamics.
More Rules for Specifications
The following rules apply to specific aspects of specification: Each of the three corpora – Hauptwerk, Schwellwerk, and Positiv – should contain the three aforementioned registrational categories – mixture plenum, reed plenum, and foundation stop ensemble; in addition, each must furnish solo possibilities for cantus firmus, duo, and trio registrations as well as accompanimental stops; the Pedal needs, in addition to the simple bass ranks, cantus firmus stops and a mixture for pedal solos. All of this can be achieved with a minimum of 25 stops, providing that correct scaling and voicing prevail; the example below illustrates this:
Hauptwerk:
Principal 8’
Octave 4’
Mixture IV 2’
Bourdon 16’
Gedackt 8’
Flöte 4’
Nachthorn III
Farbenzimbel II
Trompete 8’
Schwellwerk:
Principal 4’
Scharf VI 1 1/3’
Offenflöte 8’
Dulzian 16’
Trompete 8’
Viola da Gamba 8’
Positiv:
Principal 2’
Zimbel III 1’
Gedackt 8’
Flöte 4’
Krummhorn 8’ (French)
Pedal:
Offenbass 8’
Choralbass 4’
Rauschpfeife IV 2 2/3’
Subbass 16’
Posaune 8’
It will be noticed that our specification assigns considerably more stops to the Hauptwerk than to the other divisions. This is explained by the fact that those Positiv stops which constitute the mixture plenum are also usable for solo purposes, a feature not achievable by the corresponding Hauptwerk stops; thus the Hauptwerk and Positiv are the most important divisions for solo registrations, as the two lower keyboards lend themselves best to the difficult technique of trio playing.
It is important that the solo stops are distributed on Hauptwerk and Positiv in reasonably equal proportions. For a proper relationship of mixture and reed plena, trumpets and mixtures must be dynamically equivalent. Furthermore, the Krummhorn in combination with the Gedackt and flöte must yield a good accompanimental level for the Hauptwerk reed plenum; in turn, the Hauptwerk Principal must serve as accompanimental stop for the Krummhorn of the Positiv.
The Subbass, Offenbass, and Choralbass of the Pedal should adequately support the mixture and reed plena of the coupled manual divisions; at the same time, however, the Offenbass, alone or in combination with the Subbass, should furnish a good bass level for a trio registration. Incidentally, in this respect the pedal coupler of the unused manual division offers additional possibilities. The Choralbass should serve as a solid cantus firmus voice in trio textures; the Posaune 8’ must sustain a cantus firmus against the mixture plena of the coupled manual divisions.
The Schwellwerk is assigned to the top keyboard, the Hauptwerk to the middle keyboard, and the Positiv to the bottom keyboard; this arrangement facilitates the performance of Bach’s works, because the organ builders in Bach’s Saxony assigned the Oberpositiv to the top keyboard and the Brustwerk to the bottom keyboard. This, incidentally, corresponds to an extent with the contemporary English practice of assigning the Swell to the top, the Great to the middle and the Choir to the bottom keyboard.
The voicing of the individual stops must be precisely interrelated:
- The Gedackt must well sustain any other stop;
- c’’ of the Bourdon and c of the Flöte must correspond to c’ of the Gedackt;
- c’’’ of the Bourdon must correspond to the c’’ of the Gedackt, and so forth
- c of the Octave must correspond to the c’ of the Principal, and so forth.
- c’ of the Nachthorn (Kornett) must be related to the pipes g’’, c’’’, and e’’’ of the Gedackt
- the C of the Mixture must be related to the pipes c, g, c’, g’ of the Octave, and so forth.
Regarding the number of stops and pipes, the following distribution is recommended: the total number of stops should be compounded of 45% foundation (labial) stops, 35% labial stops of pitch levels above 4’, and 20% lingual stops. Half of the total number of stops should belong to the family of Principals.
Got it?
Gunnar Stenberg