Re: [LAU] New Bach from Aeolus and me

On 06/17/2010 07:44 PM, david wrote: Try this book: Organ-Stops and Their Artistic Registration by George Ashdown Audsley (ISBN: 9780486424231) This link has some info on how the various foot lengths relate to the harmonic series etc.: http://www.lawrencephelps.com/Documents/Articles/Beginner/pipeorgans101.html There's a stop dictionary at http://www.organstops.org/ Basic crash course:-- The main manual stops are at 8' pitch; it takes an open pipe of 8' sounding length to produce the C under the bass staff. The main pedal stops are 16', an octave lower. The pedals are usually, but not always, coupled to whatever manual is currently in use. Flue stops: The main 'organ' sound is the Diapason or Principal; these are either open pipes (Principal, Octave, Fifteenth) or stopped, with a plug in the end, sounding softer (Dulciana, Salicional). A stopped pipe sounds an octave lower than its length would indicate. Mutation stops and mixtures are also diapason-type, not used by themselves; mutations are single ranks, sounding one of the harmonic series other than the octave (Twelfth, Quint, Septime, None, Tierce, Larigot); mixtures are multi-rank, for adding brightness (Cymbel, Furniture, Cornet, Sesquialtera). There are flutey-sounding flue stops (Claribel, Hohlflute, Gedact, Gemshorn, Suabe), and stringy-sounding flues (Geigen, Gamba, Violone). Reed stops: These use reed, usually of brass, to produce the sound; they range from smooth and quiet (Cornopean, Oboe, Vox Humana) or loud & agressive (Ophecleide, Posaun, Bombarde, Trumpet). Couplers etc: These couple various manuals together, allowing stops from one manual to be played on another. Sometimes there are octave- and suboctave-couplers. E.g. in Aeolus, the Great to Pedal coupler is labelled P+1, meaning the pedals will play the stops drawn on Manual I, as well as its own. So in Aeolus, a basic organ sound is: Manual I: Principal 8, Principal 4, Octave 2 Pedal: Subbass 16, P+I From here, add any or all of Octave 1, Quint 2 2/3, Mixtur; Add or swap Principal 16 for Subbass on the pedal. (Sorry for thread hijack :))