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The Pasi Organ | Technical Specs

The visual design of the instrument calls back to historic European organs; it is entirely encased in fumed white oak woodwork with decorative carvings above the facade pipes. The wooden case serves a vital tonal factor by blending and focusing the sound of the 1,360 organ pipes. The Pasi organ is tuned in an unequal temperament that favors the keys nearest to C major while still remaining harmonious in the most distant keys.

The console’s two manual keyboards are covered with cow bone and ebony, and the pedal keyboard is made of maple and rosewood. The 23 stop knobs, controlling the organ’s three divisions of pipes, are on either side of the keyboards. The stop knobs made of Pau Ferro. Other species of wood found in the organ include tulip poplar, butternut, redwood, sugar pine, basswood, walnut, hornbeam, and Douglas fir.

The organ is laid out vertically in order to take advantage of the space. The pipes of the Great division are placed on wind chests above the impost. The Swell division is placed above the Great, hidden behind the façade pipes.

 

The Pedal division is mostly located behind the Great on separate chests where the largest pipes of the organ stand.

One electric blower supplies wind to the organ via a bellows measuring approximately 3 feet by 6 feet. The bellows is located inside the organ case under the Pedal division while the blower sits in a separate room in the basement. This wind system imparts a gentle flexibility to the organ’s sound, allowing the pipes to sound more like a choir of human voices rather than an inexpressive machine.

The key action is entirely mechanical, the organist’s fingers directly opening the valves beneath the pipes through a system of levers and thin wood connections called trackers. This ancient system gives the organist intimate control over the speech and release characteristics of the pipes, for a sensitive control of musical phrasing and articulation. 
 

GREAT

16
8
  8
  4
  3
  2
1 ⅓
  8

Bourdon+
Principal
Rohrfloete
Octave
Quinte
Octave
Mixture IV
Trumpet

SWELL

8
8
4
4
3
1 3/5
2
1
8

Gedackt
Viola
Principal
Rohrfloete
Quinte
Tierce
Gemshorn
Scharf
Dulcian

PEDAL

16
8
16
8

Subbass+
Principal*
Posaune
Trumpet*

Tremulant
(+) Some common pipes
(*) Borrows from Great
Great to Pedal
Swell to Pedal
Swell to Great
 
Mechanical Key action
Mechanical Stop action

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