I. ORGA STOPS
PITCH FOOTAGE
Thenumberappearingoneachstop,alongwithitsname,indicatesthe“pitch”or“register”ofthe
particularstop.Organscanproducenotesofdifferentpitchesfromasingleplayingkey.When
thissoundcorrespondstotheactualpitchoftheplayedkey,thestopisreferredtoasbeingof8’
(eightfoot)pitch;therefore,whenan8’stopisselectedandMiddle isdepressed,thepitchheard
isMiddle .Ifthesoundsareanoctavehigher,itiscalled4’oroctavepitch.Iftwooctaves
higher,itiscalled2’pitch.Astopsoundingthreeoctaveshigherisata1’pitch.Similarly,a16’
stopsoundsanoctaveloweranda32’stoptwooctaveslower.
Stopsof16’,8’,4’,2’and1’pitchallhaveoctaverelationships,thatis,thesewholenumbered
stopsallsoundatoctavesofwhateverkeyisdepressed. Non-octavepitchesarealsousedin
organs.TheirfootagenumberscontainafractionandtheyarereferredtoasMutations.Among
thesearethe 2-2/3’ Nasard, 1-3/5’ Tierce, 1-1/3 Quintflöte and 2-2/3 Twelfth. Because they
introduceunusualpitchrelationshipswithrespecttothe8’tone,theyaremosteffectivewhen
combinedwithotherstopsandusedeitherinsolopassagesorinsmallensemblesofflutes.
TO AL FAMILIES
1. Flues
Organtonesdivideintotwomaincategories:fluesandreeds.Inpipeorgans,fluepipesarethose
inwhichthesoundissetinmotionbywindstrikingdirectlyontheedgeofthemouthofthepipe.
Fluesincludeprincipal,fluteandstringtones. ompoundstopsandhybridstopsarevariations
withinthesethreestopfamilies.
Theterm“imitative” meansthattheorganstopimitatesthesoundofacorrespondingorchestral
instrument;forexample,animitative8’Violastopsoundslikeanorchestralviola.
2. Reeds
In reed pipes,ametaltonguevibratesagainstanopenflattenedsideofametaltubecalleda
shallot.Thecharacteristicsoundsofdifferentreedsareproducedthroughresonatorsofdifferent
shapes.Thefamilyofreedssubdividesasfollows:
YourAllenOrganprovidesauthentic,digitallysampledvoices.Theyareprotectedbycopyrights
ownedbytheAllenOrgan ompanyandarestoredinmemorydevices,eachhavingaffixedtoita
copyrightnotice;e.g.,©2003AO O,©2001AO O,etc.,pursuanttoTitle17oftheUnited
States ode,Section101etseq.
U IFICATIO
InTheatreorgans,andoccasionallyinclassicalorgans,thesystemof“unification”wasused.This
allowed the same “rank” of pipes to be used at multiple pitches and on several manuals.
UnificationwasthesystemTheatreorgansusedtohavelargenumbersofstopsontheconsole
withrelativelyfewranksofpipesascomparedtoaclassicalorgan.Forexample,aTibia lausa
rankmaybedrawnat16’,8’,51/3’,4’,22/3’,2’,and13/5’onagivenmanualandthenstill
havesomeorallofthosepitchesduplicatedonothermanuals.Inmostclassicalorgans,onerank
wouldhaveonestopkeyontheconsole;however,inaTheatreorganonerankcouldhavemany
stopkeyscontrollingit.AllenTheatreOrgansareunifiedintheauthenticTheatreorganstyle.
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