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For over fourteen years the most stable and extensive reference source on the Internet for pipe and electronic organs
The hub of this site is the Complete Articles page which gives you instant access to many detailed articles dealing with numerous technical aspects of both pipe and electronic organs. Use the Google search box below to quickly identify areas of interest. While browsing, why not also listen to over three hours of music played on the three manual organ below and the Prog Organ virtual pipe organ here?
!! NEW ARTICLE !! - Mixture Stops
This article shows how mixtures are constructed in terms of their number of ranks, their composition and the various patterns of breaks. Quint mixtures, those containing only octave and fifth-sounding ranks, are discussed in detail. 'Full' and 'sharp' mixtures are described and their functions explained. The inevitable tuning problems of mixtures are illustrated which result from including the perfectly-tuned intervals in a mixture within the tempered environment of the other stops.
Tierce mixtures, including Cornets and Sesquialteras, are described which contain a rank speaking the fifth harmonic. It is shown that their tuning problems are major and insurmountable unless one is content with a mixture in which most major thirds are grossly dissonant across the entire compass in organs tuned to Equal Temperament and some others. 'Harmonics' mixtures, those which contain the seventh harmonic in addition, are also discussed though their artistic rationale could not be discerned.
The article concludes with other topics including pipe scales and the problems caused by deriving mixtures by extension.
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The picture above is of a test rig used for experiments on pipe organ valves, such as those described in the articles entitled Calculating Pallet Size, Touch Relief in Mechanical Actions and Response Speed of Electric Actions. These can also be accessed from the Complete Articles page where summaries are also available.
This electronic organ is a dual purpose instrument containing both "straight" and "theatre" voices, designed and made by the author. It is tuned to the author's Dorset Temperament with the addition of some impure octaves as described in Keyboard Temperaments with Impure Octaves. A full specification is available for download here (PDF file, 117 kB).
The things they say:
These recordings span some years and they were made in various rooms and auditoria. The older tracks were made using analogue equipment and some were recorded acoustically using microphones, hence the occasional noises due to piston thuds and page turns, etc. Other tracks were captured electrically. All are of real players performing in real time - no synthetic MIDI 'performances' here. I have not got round yet to normalising the volume settings of all the tracks so they are compatible with each other, therefore you might wish to adjust the volume between tracks depending on which ones you select. Do not be alarmed if some tracks appear to start with an excessive noise level - this simply means they were recorded at a higher level than others. Just turn the volume down to suit. In any case, it is a wise precaution to always begin playing each track at a low level to protect your audio equipment and your ears from unexpectedly high signal levels when the music begins. Although the instrument has 13 ranks of theatre organ voices in addition to its 'straight' sounds (see specification), copyright considerations preclude the inclusion of much theatre-style music here. Playing time 1 hour 35 mins approx.
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