This organ has 3,467 pipes arrayed in 65 ranks. These ranks are
encased in 5 divisions, with a keyboard for each division:
• the Pedal division is encased in the two towers;
• the Hauptwerk is the chief (haupt) manual division;
• the Rückpositiv is at the organist's back (rück);
• the Kronpositiv is the crown (kron); and
• the Schwellwerk has shutters to reduce or increase (schwell) volume.
Ranks of pipes are engaged by pulling stop(knob)s at the console.
A stop typically controls 1 rank of pipes, with 1 pipe per key:
• 61 pipes (5 octaves) for stops in the manual divisions, and
• 32 pipes (2 1/2 octaves) for Pedal stops.
• Some stops control 2 or more ranks and provide bite or brilliance.
This organ is entirely mechanical except for a 1hp motor that supplies the wind.
The specifications of this organ are given below. Here's a translation:
The name of the stop indicates which of four families it belongs to:
• principals: prinzipals, oktaves, terzian, mixtures (III, IV, VI).
• flutes: -flötes, gedackts, subbass, nachthorn, gemshorns, quintadenas, nasats, sesquialtera.
• reeds: trompets, posaune (trombone), dulzian, bärpfeife, krummhorn, oboe.
• strings: none.
The number indicates whether a rank sounds at the unison (8') or another pitch. Some ranks sound 1 octave below the unison (16'). Many ranks sound 1 or 2 or even 3 octaves above the unison (4', 2', 1'). Two stops (2-2/3' and 1-1/3') add color by sounding at other overtones.
A Roman numeral indicates 2 or more ranks. Two-rank stops (II) add bite; stops with more ranks (III, IV, VI) add brilliance.
Couplers allow certain keyboards to be combined for greater variety of colors or more volume. Tremulants add a quavering quality. A cymbalstern is a set of bells that provides sparkle.