Korg 73key Electronic Keyboard User Manual


 
Detailed Editing with Programs Creating time-varying changes (LFO and EG)
35
Creating time-varying
changes (LFO and EG)
Using LFOs
YoucanusethecyclicchangeproducedbytheLFO
(LowFrequencyOscillator)tomodulatenumerous
aspectsofthesound.
EachProgramhastw oLFOs:LFO1andLFO2.Thereis
alsoasingleCommonLFO,sharedbybothOscillators.
WhileLFO1andLFO2areseparateforeachvoice,the
CommonLFOissharedbyallvoicesintheProgram.
Thismakesitusefulwhenyouwantallofthevoi
cesto
haveanidenticalLFOeffect.
YoucanusetheseLFOstomodulatemanydifferent
Programparameters,including:
•Pitch(forvibrato)
•Filters(forwaheffects)
•Volume(fortremolo)
•Pan(forautopanning)
TheLFOscanmodu
latemanyotherparameters,in
additiontothoselistedabove.
Using the basic LFO
1. AccesstheProgP5:LFO–OSC1LFO1page.
2. SelecttheWaveformparameter.
UsetheINCandDECbuttonstoscrollthroughthe
differentwaveforms,andlookattheirshapesinthe
graphicdisplay.
Thereareanumberofwaveformstochoosefrom.Each
aresuitedtodifferentapplications:
TriangleandSinearetheclassicLFOshapesfor
vibrato,tremolo,panning,andfilterwaheffects.
Squareisusefulforgatedonandofffilterandamp
eff
ects,andcancreatetrillswhenmodulatingpitch.
TheGuitarwaveformisdesignedespeciallyforguitar
vibrato;itbendsonlyupwardsfromthebasevalue.
SawandExponentialSawDownaregoodfor
rhythmicfilterandampeffects.
Random1(S/H)createstheclassicsamplean
dhold
effect,whichisgreatformodulatingaresonantfilter.
3. Afterlookingatthedifferentwaveforms,select
Triangle.
4. SelecttheShapeparameter,andusetheVALUE
dialtomovethroughitsdifferentsettings,from
–99to+99.
Noticehowtheshapeofthewaveformbecomesmor
e
curved,andhow–99emphasizesthelowerpartofthe
shape,and+99emphasizestheupperpart.
5. SelectthePhaseparameter,andusetheVALUE
dialtosweepthroughitsrangeofvalues.
Noticehowthewaveformshiftsfromsidetoside.
Amongotherthings,thisletsyouoffsettheLFOsfrom
oneanotherintime,whichcancreateinteresting
organiceffects.
6. UsetheFreq(Frequency)parametertosetthe
speedoftheLFO.
7. Use
theFadeandDelaysettingstocontroltheway
theLFOsoundsatthebeginningofthenote.
FormoreinformationonLFOs,pleaseseepage 42of
theParameterGuide.
AlloftheseparameterscontrolthewaythattheLFO
works.InorderfortheLFOtoactuallyaffectthe
sound,youcanusethededicatedLFOroutingsonthe
Filter,Pitch,andAmppages,orusetheLFOsasAMS
sourcesforawidevarietyofparameters.
Using EGs (Envelope Generators)
Anenvelopecreatesamodulationsignalbymoving
fromoneleveltoanotheroveraspecifiedtime,and
thenmovingtoanotherleveloveranotherperiodof
time,andsoon.
TheProgramincludesthreeEGs,forPitch,Filter,and
Amp.Theseproducetimevaryingchangesinpitch,
tone,andvolumerespectively.Theycanalsobeusedto
modulateanumberofotherprogramparametersvi
a
AMS.
Note: TheparametersthatcanbemodulatedbyanEG
andtherangeofvalueswilldifferdependingonthe
EGsprovidedforeachsection.
Waveform
Level
Time
note-on
note-off
Sutart Level
Attack Time
Decay Time
Slope Time
Attack Level
Break Level
Release
Level
Sustain Level
Release Time