Kurzweil PC3K Series - Minimum Rate; Maximum Rate; Rate Control; LFO Shape

6-38
Program Mode
The LFO Page
Minimum Rate
ThisistheslowestrateatwhichtheLFOruns.WhenitsRateControlissettoOFF,orwhenthe
controlsourceassignedtoitisatitsminimum,theLFOrunsatitsminimumrate.Aspreviously
mentioned,thevalues1/4note,1/8note,1/8triplet,and1/16
notesynctheMinimumRatewith
thePC3K’ssystemtempo.Ofcourse,ifyouchoosetotemposyncyourLFO,thentheLFOrateis
fixed,andyoucanspecifyneitherMaximumRatenorRateControl.Thedisplaychangesthusly:
Maximum Rate
ThisisthefastestpossibleratefortheLFO.WhenitsRateControlissettoON,orwhenthe
controlsourceassignedtoitisatitsmaximum,theLFOrunsatitsmaximumrate.
Rate Control
AssignanycontrolsourceinthelisttomodulatetheLFO’sratebetweenitsminimumand
maximum.AcontinuouscontrolliketheModWheelisanaturalchoice,enablingyoutogetjust
aboutanyratebetweenminimumandmaximum.Butyoucanuseaswitchcontroltoo,toget
just
theminimumormaximumwithnothinginbetween.AssigningMPressastheratecontrol
foranLFOvibratogivesyouaneasywaytoincreasethevibratorateinrealt ime,asyoucanon
manyacousticinstruments.
LFO Shape
TheshapeoftheLFOwaveformdeterminesthenatureofitseffectonthesignalitsmodulating.
AneasywaytochecktheeffectsofthedifferentLFOshapesistosetLFO1asthevalueforthe
Src1parameteronthePITCHpage,andsettheDepthforSrc1to
400centsorso.Thengotothe
LFOpage,settheMinandMaxratesforLFO1at0.00 Hzand4.00 Hzorso,andsettheRate
controltoMWheel.NowplayyourMIDIcontrollerandyou’llheartheLFO’sratechangewhen
youmoveitsModWheel.Select
differentLFOShapesandcheckouttheeffectonthepitch.
LFO Phase
UsethisparametertodeterminethestartingpointoftheLFO’scycle.Onecompletecycleofthe
LFOis360degrees.0degreesphasecorrespondstoacontrolsignalvalueof 0,becoming
positive.Each90‐degreeincrementinthephaserepresentsaquarter‐cycleoftheLFO.
WhenanLFO
islocal,thephaseparametergivesyoucontroloverthestartingpointoftheLFO
foreachnote(forexample,youcouldmakesureeveryvibratostartedbelowthepitchyou
playedinsteadofatthepitchyouplayed).TheLFO’sphasealsoaffectsglobalLFOs,although
it’softenindistinguishable,since
globalLFOsstartrunningassoonastheprogramcontaining
themisselected,evenifyoudon’tplayanynotes.