Arnstadt Bach Organ

Arnstadt, Bach organ (Wender 1703)

The New Church in Arnstadt was where the young Johann Sebastian Bach has got his first job as an organist at the age of 18. He served there from 1703 to 1707. After Johann Friedrich Wender erected the new organ in 1703, it was Johann Sebastian Bach who inspected and inaugurated it. The Weimar consistory had sent the young, talented musician to Arnstadt, and the church committee, thrilled by his skills, immediately offered him the position as the organist. However, Bach was not completely happy there and he often had conflicts with other musicians and students of the local school. The situation became even worse when he disappeared for several months in 1705 after being granted leave for only 4 weeks. During this time he traveled to Lübeck to hear and study with Dietrich Buxtehude. In 1707 he left Arnstadt for Mühlhausen, and a year later he started to work for the Duke of Weimar.

Although Bach stayed in Arnstadt for only a few years, it was where he composed many of his famous organ works. For example:
Präludium und Fuge a-moll / BWV 551
Fantasia C-Dur / BWV 570
Fantasia h-moll / BWV 563
Fuge c-moll / BWV 574
Fuge c-moll / BWV 575
Präludium (, Trio) und Fuge C-Dur / BWV 545
Präludium E-Dur / BWV 566
Präludium G-Dur / BWV 568
Präludium und Fuge C-Dur / BWV 531
Präludium und Fuge c-moll / BWV 549
Präludium und Fuge e-moll / BWV 533
Präludium und Fuge G-Dur / BWV 550
Präludium und Fuge g-moll / BWV 535
Toccata und Fuge d-moll / BWV 565

The Wender organ may seem surprisingly limited for the great Bach and this set of pieces. Nevertheless, that is the reason why I include it in my Sonus Paradisi organ library. This way, everyone can have the chance to practice Bach pieces on the organ he had at his disposal in Arnstadt. The instrument is a two-manual organ with 21 stops. All divisions share a single case. The great organ offers no less than 6 stops of 8', a low quint (without a corresponding 16' stop!), Octave 4, Mixture, and a Cymbel. The positiv (Brustwerk) offers 7 stops in total, none of them a reed. The pedal division is limited to 4 stops, including a solo reed Cornet 2'. Interestingly, this pedal cornet is the only independent 2' stop of the entire instrument. While the organ offers few aliquotes, there is an outstanding range of color in the various foundation stops of wide, normal and narrow scaling.

The organ has not survived until the present intact. Changed considerably several times in history, only about 25% of the original pipes exist today, although the facade of the organ case is original. The original console of the Wender organ was moved to the local museum in 1864 and it was not reused during the latest restoration. Also, the windchests, action, and all the other inner workings were made in 2000 when Orgelbau Otto Hoffmann provided a detailed reconstruction of the Wender organ. Hoffmann's work was performed according to the original agreement of the church with Wender dated 1699, although there is no certainty that Wender built the organ exactly as described in this agreement. The missing stops were reconstructed after contemporary models; Posaune and Trumpet after Lahm (Herbst, 1728), Cornet after Abbenrode (Contius, 1708), Subbass after Horsmar (Wender, 1694).

Further reading:

Colin Pykett: The 'Bach Organ' at Arnstadt  (thanks to the user "larason2" for the link)


The samples are offered in 48kHz/24bit resolution. The multiple releases have three levels: short, mid and long. Hauptwerk v4.2 and higher supported. The sample set is offered in plain wave format.

Reverb time

The reverb time is ca. 3 seconds.

Keyboards, pedalboard

The original compass of the keyboards is 48 keys (C,D-c3), extended in Hauptwerk to f3 via a dedicated mixer switch. Low C# added, too. The original compass of the pedal division is 25 keys (C,D-c1,d1), extended to f1 fully chromatically in the sample set. The original and the extended compas is user selectable via a dedicated switch on the mixer tab in Hauptwerk.


All ranks were recorded with the Tremulant for the most convincing tremulant behavior. The ranks are marked "tremmed" in the rank description.


RAM consumption: 8-channel surround

16-bit, other settings default: 18 GB

20-bit, other settings default: 29 GB (recommended)

24-bit, other settings default: 34 GB

Screen resolution 1280x1024 px or more.

Polyphony of 6000 voices recommended for the full suround (3000 pipes minimum).

Surround format

The sample set is offered in the Surround variant (8 channels). There are direct channels, featuring the sound of the organ immediately in front of the organ case. The diffuse perspective captured the sound in the church, further from the organ. The distant channels were captured even further from the organ. The rear perspectives is designed for the rear speakers of the audio setup. The perspectives can be mixed together freely to achieve any virtual listening position, or used separately - depending on the prefererences of the user. A dedicated "mixing desk" is available in Hauptwerk to mix the sound to the desired level.


Oberwerk C,D-c3 [-f3]    Brustpositiv C,D-c3 [-f3]     Pedal C,D-c1,d1 [-f1]     
Principal 8'
Viol di gamb 8'
Quintadena 8'
Grob gedakt 8'
Gemshorn 8'
Quinta  6'
Octava 4'
Trompet 8'

Still Gedakt 8'
Principal 4'
Spitz flote 4'
Nachthorn 4'
Quinte 3'

Sub Bass 16'
Principal Bass 8'
Posaunen Bass 16'
Cornet Bass 2'



  • I/II, II/P. More couplers may be achieved through the Hauptwerk Master Couplers.


  • Tremulant for the whole organ.Vogelsang, Glocken in C, Glocken in G, a bell to a calcant.






Console view:

This is the general console view. It serves to define the keyboard MIDI inputs for all the divisions. The active part of this view are the manuals, and the pedal. Specifying the MIDI inputs is done by right-clicking on the desired manual or pedal.




Mixer view:

The virtual listening position is adjusted here. Dragging the sliders downwards means to mute the mic perspective, dragging them up is making it louder.
The mixer settings can be stored, retrieved, reset. 3 different mixer settings can be stored/recalled any time.
The switches:
- the selection for the tremulant between the sampled tremulant and artificial (Hauptwerk model) tremulant possible.
- Mixtures fine tuning: toggle between the recorded natural mixture sound which is usually somewhat beating, and perfectly tuned mixtures.
- The blower switch should be always on. When off, the wind to the organ will stop and there will be no sound.
- The compass selector allows to play either the original organ compass, or the extended one.
- Pipe coupling serves to adjust the amount of "chorus effect". Higher slider position gives more overall mistuning to the organ pipes, possibly giving rich and tasteful organ sound. Lowest position of the slider offers the organ perfectly in tune instead (especially when combined with Hauptwerk Temperament charts)
- Pipe detune - sets the overall mistuning o pipes. In the minimum position, the organ is exactly in tune (when some Hauptwerk temperament chart is used).



Stops view:

All stops of the instrument can be accessed from a single screen. Each stop can be MIDI-learned by right click.





Left+Right Jambs view:

All the stops and other controls of the organ can be found also here. The layout for dual touch screens. The design allows for portrait or landscape orientation, according to the orientation of the touch screens.




Left + Right Jambs Vertical view:

the dual stop jambs offer vertical (portrait) orientation as an alternative.






Simple Jamb:

simplified version of a single jamb to allow for more readable version of the stop names on small LCD touch screens. There are two variants: landscape and portrait. All the stops of the organ can be found here. Physical pistons or draw stops can be assigned to a virtual button on screen by right-clicking on the button.


  1. Arnstadt Bachorgel Sample Set, vol.0

    Arnstadt Bachorgel Sample Set, vol. 0. Surround, 8-channels. Minimum Hauptwerk version: 4.2. (Also works in all higher versions.) No encryption. Free volume, 9 stops.
    Price: Excl. Tax: €0.00 Incl. Tax *: €0.00 Excl. Tax

    Detail & order

  2. Arnstadt Bachorgel Sample Set, vol.1

    Arnstadt Bachorgel Sample Set, vol. 1. Surround, 8-channels. Minimum Hauptwerk version: 4.2. (Also works in all higher versions.) No encryption. Works together with Vol.0 forming the full sample set. You need to download and install also the vol.0 to get the full sample set working!
    Price: Excl. Tax: €157.00 Incl. Tax *: €189.97 Excl. Tax

    Detail & order