I GRAN ORGANO (North side)
    16       Flautado Principal
    16       Flautado Violon
     8       Flautado Fachada
     8       Flautado Violon
     8       Flauta Armonica
     8       Flautado Kuerólophon
     4       Octaviante
    VI       Lleno Docena
    16       Bombarda
     8       Trompeta Real
     8       Trompeta Respaldo
     8       Trompeta Armonica
     8       Corno Inglese
    8+4      Bajoncillo y Clarin
 
II CONCERTANTE (South side)
    16       Flautado Principal
    16       Gamba
     8       Flautado
     8       Flauta Armonica
     8       Flauta Euskarina
     8       Hierodofóno
    VII      Lleno Docena
     8       Corneta
    16       Bombarda
     8       Trompeta Respaldo
     8       Trompeta
     8       Trompeta Angélica
     4       Bajoncillo
     enclosed:
     8       Violoncello
     8       Flauta Traversera
     8       Viola
     8       Violon
     8       Violon
     8       Voz Humana
     -       Campanólogo (30 bells, from c1)
 
III POSITIVO (North side)
    16       Flautada Violon
     8       Flauta Dulce
     8       Flauta Armonica
     8       Violon
     8       Flauta Dulciana
     8       Unda Maris
     4       Ocarinas
    IV       Lleno en Quincena
     8       Corneta
    16       Fagot
     8       Trompeta Real
     4       Bajoncillo
     -       Piano Arpa (56 metal strings)
 
IV RECITATIVO (North side)
    16       Quintatono
     8       Flauta Traversera
     8       Violon
     8       Kuerólophon
     8       Gamba
     8       Voz Celeste
     4       Octava de Gamba
     2       Quincena Armonica
     V       Corneta (from c1)
     8       Clarinete Fachada
     8       Fagot y Oboe
     8       Voz Humana
 
PEDAL (South side)
    32       Contra Profundas
    16       Contra
    16       Violon Bajo
     8       Violoncello
     8       Flautado Violon
     4       Bajete
    2 2/3    Nazarde
    32       Contra Bombardón
    16       Bombardón
    16       Contra Fagot
     8       Trombón
 
Spare stops:  1 Positivo, 2 Recitativo, 2 Pedal.
 
Pedals on left side:
  Tormenta (orage)
  Concertante to Gran Organo
  Positivo to Gran Organo
  Recitativo to Gran Organo
  Tremulant to Concertante
  Gran Organo to Pedal
  Concertante to Pedal
  Positivo to Pedal
  Recitativo to Pedal
 
Pedals on right side:
  Tremulant to Recitativo
  Positivo sub8ve
  Concertante sub8ve
  Positivo 8ve
  Concertante 8ve
  Ventil: Gran Organo & Pedal silent
  Ventil: Pedal reeds & mutations silent
  Ventil: Gran Organo silent
  Ventil: Concertante silent
  Ventil: Positivo silent
  Ventil: Recitativo silent
 
Balanced swell pedals:
  Expression to enclosed stops of Concertante
  General crescendo (blind)
  Expression to Recitativo
 
Compass: 56/30.
4,431 pipes.

The organ was built in the old cases on the North and South sides of the Coro. 'Fachada' and 'Respaldo' indicate pipes in the choir case-front and aisle-case-front respectively. The drawstops were arranged in five horizontal rows on each side of the keyboards, with seven stops in each row. The expressive stops of the Concertante were placed above the top manual. The action to the North side was pneumatic and that to the South side electric. The detached console was situated on the North side.


SOURCES:
An article by Ernest Adcock in 'The Organ' quarterly, July 1921, and Fernando Germani's 'Metodo per Organo' vol. 4, 1952.