I've been having a think about what sort of organ I would build in St. Peters and NPOR and the excellent page on church website (
http://www.stpetersnottingham.org/music/organ.htm) provides a lot of information and photos.
NPOR gives the specification of the original 1812 organ here:
http://www.npor.org.uk/cgi-bin/Rsearch.cgi...ec_index=C00952 and its subsequent ... development...
I note the organ is by Lincoln and aspertions are cast whether the case is in fact by Snetzler. I rather suspect the Keraulaphon on the pre-1863 specification is a later addition.
LayoutThe Great Organ would be in the "Snetzler" case, facing west in the North Transept, all of it forward of the arch, for which it may be necessary to deepen the case (I suspect this case has already been hacked about and probably only the frontage survives). Speaking west, finally fully released into the main body of the church, with a full chorus from 16' to mixture (the large quint mixture could reach into the 16 foot series in the treble), it would be the principal division to accompany the congregation - the 16' tone would support the men's voices as they sing down an octave. The Great case would not have a back, allowing the divisions behind it to speak through the Great Organ into the main body of the church, but we would need to accept the Great Organ would be the dominant force.
Immediately behind the Great case, in the chamber, would be the small pedal soundboard at slightly lower level. This would still allow the Pedal Trumpet 8 and Principal 8 to get the space they need to give the pedal line some definition. More pedal upperwork could be specified if there is space and the appetite for it. The larger pedal ranks would be along the north wall of the chamber but not tucked in behind the swell box. From there they should be able to get round the corner into the building, as benefits long wavelength notes, but without blocking the Swell Organ.
The Swell Organ would be behind/east of the small pedal chest at a higher level, speaking west over the tops of the small Pedal and Great organs as much as possible to get the sound out. This would to enable it to speak out behind the Great Organ in the traditional British manner and colour the Great Organ for variety of tone accompanying the hymns and assist in the build up in the traditional manner. I have kept the Swell organ as small as possible so the box can be as compact as possible without crowding the planting to encourage good projection. In addition, the acoustics of the organ chamber will need to be made as good as possible to get the sound out - such things as a soft wood ceiling and soft porous plaster might need careful redecoration or covering.
Although the Swell Organ would point west, the swell box would also have shutters facing north, into the chancel through the North chancel arch. In front of it, in and in front of the arch, the Choir Organ would occupy a new case, speaking south into the chancel to accompany the choir. The Choir Organ would have plenty of foundation and 4' tone to accompany the choir without overwelming it and acts as a miniature Great Organ, with the Swell Organ behind it.
There would be passage boards between the Great Organ and Small Pedal Organ soundboards, in front of the swell box and down the south side of the swell box to get access to the Choir Organ.
The Great organ is based on the 1812 specification and the nature of the organ would be what if a first rate Victorian builder like Hill had rebuilt the Lincoln organ in about 1860 into a comprehensive 3 manual town church organ:
Great Organ1. Double Diapason 16 (stopped bass, maybe an open treble - maybe not unlike an Aubertin Portunal)
2. Open Diapason 8
3. Stopped Diapason 8
4. Principal 4
5. Flute 4
6. Twelfth 3
7. Fifteenth 2
8. Sesquialtera III (17.19.22, 12.15.17)
9. Mixture IV (19.22.26.29)
10. Trumpet 8
11. Clarion 4
Swell Organ12. Bourdon 16
13. Open Diapason 8
14. Stopped Diapason 8 (CB for Gambe)
15. Gambe 8 Tc
16. Voix Celestes 8 Tc
17. Principal 4
18. Mixture IV (15.19.22.26)
19. Fagotto 16
20. Cornopean 8
21. Oboe 8
Choir Organ22. Open Diapason 8 (in case prospect, maybe to tenor G if space precludes a full bass)
23. Keraulophon 8 (maybe to tenor C if space is limited)
24. Gedeckt 8 (common bass)
25. Gemshorn 4
26. Suabe Flute 4
27. Piccolo 2
28. Clarinet 8
Pedal Organ29. Grand Open Diapason 16
30. Violone 16
31. Bourdon (s) 16
32. Quint 12
33. Principal (s) 8
34. Trombone 16
35. Trumpet (s) 8
Pedal pipes marked (s) are on the small Pedal Organ soundboard.
Swell to Great
Swell to Choir
Choir to Great
Swell to Pedal
Great to Pedal
Choir to Pedal
Registration aids as appropriate - if it is EP action, I would suggest 1-6 Divisionals and generals with stepper, with unlimited memory; if the action is to be fully mechanical I would suggest 1-4 composition pedals to the Great and Swell organs, with a reverser for Great to Pedal and Pedal Trombone.
I wondered if it was worth putting the Clarinet on to the Great Organ in this case. As the Great Organ would not have a role accompanying the Choir, it could be better used for the typical solo voices for choral accompaniment.
If a high-pressure party horn is deemed vital, it could be put either above or in front of the small pedal organ, if there is space, playable from the Choir Organ keys. I do not think a Great Reeds on Choir transfer or making the Great Reeds available on the Choir Organ for solo purposes would be appropriate on this organ.
I would suggest this scheme could do all the proposed organ can do, for about 2/3 of the stops. It would be very fine for Baroque music as well as Romantic and modern music - there is the potential to perform much of the French Classical school. Although one really needs the real thing to do it authentically (and many modern eclectic instruments fall short), this organ should be able to muster a Plein Jeu avec Pedale de Trompette, Grand Plein Jeu and Petit Plein Jeu, Grand Jeu, dialogue sur le Cromorne et Cornet (using the Great Sesquialtera - not authentic but it should work), Basse et Dessus de Trompette, etc. Bach chorales and choral partitas shouldn't be an issue either - the 4' pedal reed can be achieved using the Great Clarion and there should be a good chorus for the Preludes and Fugues. The French Romantic and German Romantic schools shouldn't be out of the question and it should be a natural at the English schools of music. With the large, west-facing Great Organ, it would be well-placed to accompany the congregation and the north-facing Choir Organ should be able to dispatch its choral accompanimental duties with aplomb. In addition, it would be a pesuasive and flexible recital instrument.
My main concern with this organ would be what to do with the action - with 2 divisions facing west and another facing south, there could be some difficult action runs for at least one of the divisions and such is the distance in the organ that the actions might end up heavy and spongey if the action is mechanical. A pneumatic or electro-pneumatic action might be a more pragmatic choice.
The only other fly in the onitment is that such an organ would cost in the region £600,000-£700,000...