Kurzweil PC3K Series - Chorus

9-16
Effects
Chorus
Duckingreversestheactionofthegate.Normallythisifsetto“Off”,andthegateopenswhen
theinputsignalrisesabovethethreshold.Butwhenthisis“On”,thegatecloseswhentheinput
signalrisesabovethethreshold.
Atk(Attack)Timeisthetimeforthegateto
rampfromclosedtoopen(reverseifDuckingison)
afterthesignalrisesabovethreshold,adjustablefrom0.0to228.0ms.
Rel(ease)Timeisthetimeforthegatetorampfromopentoclosed(reverseifDuckingison)
afterthegatetimerhaselapsed,adjustablefrom0to
3000ms.
Super Gate
SuperGateisamoresophisticatedgatethatinclud esthesetwofunctions:
EnvTimeistheamountoftimeittakesforthesidechainsignalenvelopetodropbelowthe
threshold.Ifthistimeistooshort,thegatecancloseandopentooquicklyfromamplitude
modulationinthesidechain
signal.Ifitistoolong,thegatemaystaycloseduntiltheenvelope
hasachancetofall,andsomesignalswouldnotgetthrough.Thisparameterisonlyineffect
whenRetriggerisOff.
Retriggerdetermineswhetherthegatetimerwillresetitselfeachtimethesidechainsignalgoes
abovethethreshold.Ifitis“On”,thetimerresetsitself,andthereforethegatestaysopenaslong
asthesignalisabovethethreshold,orkeepsgoingabovethethreshold,withintheinterval
specifiedbyGateTime.Ifitis“Off”,thegateclosesdownafterEnvTime
haselapsed,
regardlessoffthesidechainlevel,andthesidechainlevelmustfallbelowthethresholdand
comebackupagainbeforethegatewillopenagain.
Chorus
Chorusisaneffectwhichgivestheillusionofmultiplevoicesplayinginunison.Theeffectis
achievedbydetuningcopiesoftheoriginalsignalandsummingthedetunedcopiesbackwith
theoriginal.Lowfrequencyoscillators(LFOs)areusedtomodulatethepositionsofoutputtaps
fromadelayline.
Themovementofthetapscausesthepitchofthesignaltoshiftupanddown,
producingtherequireddetuning.
Thechorusesareavailableasstereoordualmono.Thestereochoruseshavetheparametersfor
theleftandrightchannelsganged,whilethedualmonochoruseshaveseparateleftand
right
controls.
FdbkLevelisthelevelofthefeedbacksignalfromtheLFO1delaytapintothedelayline.
Negativevaluespolarity‐invertthefeedbacksignal.
TapLvlsetsthelevelsoftheLFO‐modulateddelaytaps.Negativevaluespolarity ‐invertthe
signal.Settinganytaplevelto0%turns
itoff.
TapPansetsthestereopositionforagiventap’soutput.Therangeis‐100%forfullyleft,to100%
forfullyright.
LFORatesetsthespeedofmodulationofthedelaylineswitharangeof0.01to10Hz.
LFODpthsetsthemaximumdetuningdepthof
theLFO‐modulateddelaylines,witharange
from0to50cents(=1/2semitone).
TapDlyaddsextradelayinfrontoftheLFOmodulateddelaytapsfrom0to230ms.
L/RPhaseorLFOnLRPhsadjuststherelativephasesoftheLFOsfortheleftandright
channels
inthestereoChoruses.