Kurzweil PC3K Series - Reverbs

Effects
General Parameters
9-11
A‐>Bcfg(configuration).Incombinationalgorithmsthatcontaintwo(ormore)components,
andwhosenameuses“<>”,asin719“Reverb<>Compress”,theorderinwhichthesignalpasses
throughthetwocomponentscanbechanged.Forexample,thisalgorithmcanbeconfiguredso
thesignalpassesthroughthereverbfirst
andthenthecompressor,orthroughthecompressor
firstandthenthereverb.Thecfgparameterdeterminestheconfiguration,anditsvalueis
context‐sensitive—inthisexample,thechoiceswouldbe“Rvb‐>Cmp”and“Cmp‐>Rvb”.
A/Dry‐>Bisalsofoundinmanycombinationalgorithms,andcontrolstheamountof
signalthat
willpassdry(unprocessed)throughthefirstcomponentinto thesecondcomponent.Different
combinationalgorithmsusedifferentvariationsonthisparameter,dependingonthecontext.
Therangeis0to100%.
Reverbs
RoomTypechangestheconfigurationofthealgorithmtosimulateawidearrayofroomtypes
andsizes
includingbooths,smallrooms,chambers,hallsandlargespaces.Becausethis
parameterchangesthestructureofthereverbalgorithm,youneedtobecarefulwhenassigning
itaMOD—changingitinrealtimewhilesignalispassingthroughitislikelytocauseaudible
artifacts.Roomtypesindifferentalgorithms
withsimilarnamesdonotnecessarilysoundthe
same.
RvrbTimeistheRT
60
—thetimeittakesforthereverbtodecayto60dBbelowitsinitiallevel—
inseconds.Itisaccurateassumingthatseveralotherparameters(HFDamping,DiffScale,Size
Scale,andDensity)areattheirnominallevels.Itisadjustableupto“Inf”,whichcreatesan
infinitely‐sustainingreverb.
LateRvbTim
adjuststhebasicdecaytimeofthelateportionofthereverbafterdiffusion.
L/RPreDly(Pre‐Delay)isthetimebetweenthestartofasoundandtheoutputofthefirst
reverbreflectionsfromthatsound.Longerpre‐delayscan helpmakelargerspacessoundmore
realistic.Longer
timescanalsohelpimprovetheclarityofamixbyseparatingthereverbsignal
fromthedrysignal,sothedrysignalisnotobscured.
EarRefLvladjuststhemixleveloftheearly‐reflectionportionofalgorithmswhichofferearly
reflections.
LateLvladjuststhemixlevelofthe
late‐reverbportionofalgorithmswhichofferearly
reflections.
DiffScalescalesthe“diffusion“oftheearlyreflections,thatis,howspreadouttheyareasa
groupovertime.Atverylowsettings,the earlyreflectionsstarttosoundquitediscrete,andat
highersettingstheearlyreflectionsareseamless.
Itisadjustablefrom0.00to2.00,with1.00
beingnominalforthegivenRoomType.
Densitycontrolshowtightlytheearlyreflectionsarepackedintime.LowDensitysettings
grouptheearlyreflectionsclosetogether,whilehighervaluesspreadthereflectionsfora
smootherreverb.Itisadjustablefrom0.00
to4.00,with1.00beingnominal(andusuallyoptimal)
forthegivenRoomType.
Expansecontrolstheamountoflatereverbenergybiasedtowardtheedgesofthestereoimage.
Asettingof0%willbiasenergytowardsthecenter.Movingawayfrom0%willbiasenergy
towardsthesides.Positive
andnegativevalueswillhaveadifferentcharacter.
Buildadjuststheenvelopeofcertainportionsofthereverb.Positivevaluesspeedupthe
envelope,andnegativevaluesslowitdown.
SizeScalechangesthesizeofthecurrentroom.Alteringthisparameterwillchangethereverb
timeandalsocausesomecoloration
ofthereverb.Itisadjustablefrom0.00to4.00,with1.00
beingnominal(andusuallyoptimal)forthegivenRoomType.