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For over eighteen years the most stable and extensive resource 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 4Ĺ hours of music played on the three manual organ below and the Prog Organ virtual pipe organ here?
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!! NEW ARTICLE !! - The physics of voicing organ flue pipes
Despite its apparent simplicity, details of how the organ flue pipe works have fascinated musicians, organ builders and scientists for centuries and it still continues to attract attention today. One reason for this is that the actual mechanisms are extremely complex, to the extent that they still lie somewhat beyond the reach of physics. This also applies to the techniques used in voicing the pipes, and it is this aspect on which this article focuses. However the rationale of the article is not so much to describe what a voicer does, which has been covered by others, but to shed light on the physical principles involved. This does not seem to have been attempted before, at least not without resorting to advanced mathematics. However maths makes no appearance here because the article is intended for the general reader, and in any case there still exists an unfortunate gulf between theory and experiment relating to organ pipes. Nine of the most important adjustments available to the flue pipe voicer are discussed in detail, including the somewhat mysterious technique of 'nicking' often applied to the languid and lower lip. The attack transient of a flue pipe is also covered. In each case the discussion draws out the physics involved as well as the consequential aural effects such as changes to timbre and power. Comprehensive cross-references to other articles elsewhere on the site are provided, and these can be accessed immediately using the links provided.
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 can be downloaded here (PDF file, 717 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.