Dual Purpose Organ - Specification
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Classical Stop List

(the colours below are those used on the engraved drawstops)

 

SWELL (enclosed)

  

GREAT

    CHOIR (enclosed)   

PEDAL
 
Geigen Diapason 8 Double Diapason 16       Contra Dulciana 16       Contra Bass 32
Gedeckt 8 Open Diapason 8       Open Diapason 8       Major Bass 16
Salicional 8 Gemshorn 8       Stopped Diapason 8       Violone 16
Violes Celestes 8 Claribel Flute 8       Quintadena 4       Sub Bass 16
Geigen Principal 4 Principal 4       Nason Flute 4       Octave 8
Flageolet 2 Harmonic Flute 4       Nazard 2 2/3 Bass Flute 8
Mixture III Twelfth 2 2/3 Block Flute 2       Fifteenth 4
Double Trumpet 16 Fifteenth 2       Tierce 1 3/5 Mixture III
Cornopean 8 Seventeenth 1 3/5 Larigot 1 1/3 Trombone 16
Trompette 8 Quartane II      Sifflote 1       Schalmei 4
Clarion 4 Trumpet 8       Corno di Bassetto 8      
Fanfare Trumpet 8      
 
Tremulant Tremulant
 
Sub Octave Swell to Great Swell to Choir Swell to Pedal
Super Octave Great to Pedal

Choir to Pedal

 

 

Theatre Stop List

(the colours below are those used on the engraved stop keys)

 

ACCOMPANIMENT

     

GREAT

  

SOLO

     

PEDAL

(enclosed)

     (enclosed)     

(enclosed)

 
Diapason 8 Tuba 16       Trumpet 8 Baryphone 16
Flute 8 Tibia 16       Tibia 8 Violone 16
Viola 8 Cello 16       Clarinet 8 Sub Bass 16
Krumet 8 Tibia 8       Orchestral Oboe 8 Cello 8
Octave 4 Kinura 8       Vox Humana 8 Flute 8
Flute 4 String 8       String 8
Viola 4 Tibia 4       String Celeste (TC) 8
Piccolo 2 Violin 4      
Tibia 2 2/3
Tibia 2      
Salicet 2      
  Sub Octave Accpt to Pedal
Super Octave
 
Tremulant Tremulant Tremulant

 

 

 Accessories

 

5 thumb pistons to each manual department

5 toe studs to pedal

5 general toe studs

Great to Pedal reversible thumb piston, duplicated by toe stud

Swell to Great reversible thumb piston, duplicated by toe stud

Choir to Pedal reversible thumb piston

 

Combination capture system with 8 memories each for the classical and theatre organs

Stop control by moving drawstops for the classical organ (magnetically operated)

Stop control by moving stop keys for the theatre organ (magnetically operated)

Setter button

General Cancel piston

 

Rocking tablet to select Classical or Theatre Organ.  The drawstops on the Classical organ are automatically cancelled when changing to 'Theatre' mode.  The stop keys on the Theatre organ are automatically cancelled when changing to 'Classical' mode.

 

2 tremulants to the classical organ - independently adjustable in speed and depth

3 tremulants to the theatre organ - independently adjustable in speed, depth and modulation waveshape (sine through to square, continuously variable)

 

 

Tuning and Temperament

 

The instrument is tuned to A = 440 Hz using my Dorset Temperament with impure (offset) octaves.

 

 

Tonal Derivations

 

Most of the 'classical' voices were derived from the four manual 1927 Rushworth and Dreaper organ at Great Malvern Priory, England.  Exceptions are the 8 and 4 foot flutes on the choir organ which were derived from the 1858 Walker organ at St Mary's church, Ponsbourne, Hertfordshire, England, and the 4 foot Quintadena on the choir organ which was derived from a stop made by Brian Daniels, Crewkerne, England.

 

Most of the 'theatre' voices were derived from the three manual Wurlitzer and Rutt organs preserved at the St Albans music museum, England.

 

 

Acknowledgements

 

Thanks are due to the church authorities at Malvern and Ponsbourne and to the trustees at St Albans for allowing the acoustic samples to be recorded.  Thanks are also due to Brian Daniels for allowing his Quintaten stop to be sampled, and to Paul Minchinton for making the recordings at Ponsbourne.