Polaron.de Apps Overview Napo / Virtual Organ Apps de en


App Version: 8.8
Napo Version: 4.23

released 2019-02-28

Audiobus Compatible

About the App

StrandOrgan is an iOS application which allows you to play Lars Palo's sampleset of the Strand organ of the church in Kalvträsk, Sweden, on a MIDI keyboard connected to your iOS device. StrandOrgan is based on the Napo framework. Please read the Napo documentation and in particular the Napo user manual to learn about its features and limitations.

StrandOrgan makes use of the (non-extended, originally tuned part of the) Kalvträsk Church sampleset. The app's Gallery view shows photos that are part of the sampleset package. The stop button images and the Console view's background image are derived from one of these photos.

While StrandOrgan 1.0 - 4.0 used the beta 1 version of the sampleset, which had 44.1 kHz / 16 bit, StrandOrgan 5.0 switched to the beta 2 version, which has 48 kHz / 24 bits. For the app, only 16 bits of the sampleset files are used, as we did not want to spend additional 50% of memory and memory bandwidth for a questionable improvement of the sound quality that nobody hears under real conditions. However, the sample rate of the beta 2 sampleset was kept for StrandOrgan. This means that the app now works with 48 kHz or with downsampled files at 24 kHz.

StrandOrgan 6.0 extended the note range up to the high c. Furthermore, starting with StrandOrgan 6.0, the app makes use of the noise files (blower noise, keys noise, stop knobs noise) that are part of the beta 2 sampleset. In the General / Acoustics section of the Settings view, the user can choose whether these sounds will be played or not. With StrandOrgan 7.0, the volumes of the noises can be configured, and MIDI velocity can be used to control the amplification of the keys noise.

About the Sampleset

The Kalvträsk Church sampleset is provided by Lars Palo under the Creative Commons Attribution-ShareAlike 2.5 license, see http://creativecommons.org/licenses/by-sa/2.5/. Four your convenience, all needed files of the sampleset are included in the app, but you can also download the set independently from http://familjenpalo.se/vpo/download if you would like to use it with other software (e.g. GrandOrgue). Concerning sample sets that are subject to a CC license, see here also.

About the Organ

According to Lars Palo's documentation, this organ was built in 1839 by Per Zacharias Strand for the church in Burträsk and relocated to Kalvträsk around 1903. Apart from an electric blower, it is in its original state.

The organ is a single-manual (54 keys) instrument with seven ranks, three of them divided in bass and diskant stops (bass = lowest octave, diskant = above), and a constantly coupled pedal (27 keys) without own stops. Fugara 8' has no pipes at the lowest octave. The organ's pitch is 436 Hz. This is the stops specification:

Name Notes
Principal 8' Bass C-B
Principal 8' Diskant c0-f3
Gedackt 8' C-f3
Fugara 8' c0-f3
Octava 4' Bass C-B
Octava 4' Diskant c0-f3
Qvinta 3' C-f3
Octava 2' C-f3
Trumpet 8' Bass C-B
Trumpet 8' Diskant c0-f3

Sound Examples

Composition Link
Lars Guldbrand (own work): Sonatin 4.2 MB (MP3 file)
Rob Peebles: BWV 601 SoundCloud
Michael Atallah, Michelle Maltais: Toi Notre Dame SoundCloud

The beautiful piece of Lars Guldbrand, recorded with StrandOrgan 2.0 running on an iPad 2, shows what can be done when the app is used in combination with a MIDI sequencer and a program like GarageBand. Lars created this recording by playing single tracks in different registrations and subsequent mixing. An independent pedal is simulated by transposing tracks, and reverb is added by GarageBand. So there is quite some work involved in this!

Demo Videos

Composition Link
Michel Corrette, Les Folies d'Espagne YouTube
Gaspard Corrette, Concert pour les Flûtes YouTube
Mark Lloyd Music: Georg Philipp Telemann, Vater unser im Himmelreich YouTube
Mark Lloyd Music: Charles Gounod, L'Angelus YouTube
Zé Osório, Cathedral for all YouTube