Korg PS60 Smoothing, Shape

Program Edit

Offset [–199...+199]

ThiscontrolstheamountofoffsetforAMSA.

SettingOffsetto+199shiftsanAMSinputof–99alltheway

to+99.InconjunctionwithhighAMSAAmountvalues,this

canbeusefulforcreatingclippedshapes,suchasshownin

thelastofthe“AM S MixerOffsetexamples,”above.

Smoothing

ThisMixerTypesmoothsouttheAMSinput,creatingmore

gentletransitionsbetweenvalues.Youhaveseparatecontrol

oftheamountofsmoothingduringtheattack(whenthesig‐

nalisincreasing)anddecay(whenit’sdecreasing).

ThehighertheAttackandDecaysettings,themorethe

inputwillbesmoothed.

Lowsettingsprovidesubtlecontrollersmoothing,creating

moregradualaftertouch,forinstance.Highersettingscreate

auto‐fadeeffects,transformingaquickgestureintoalonger

fade‐inand/orfade‐outevent.

Smoothingcanalsobeusedtoaltertheshapeofprogram‐

mablemodsources,suchasLFOsandEGs.Forinstance,

youcanturna“blip”intoasimpleenvelopeshape,as

shownbelow.

AMS Mixer Smoothing examples

AMS A Source [List of AMS Sources]

ThisselectstheAMSsourcetobesmoothed.

ForalistofAMSsources,pleasesee“Alt e r n a t e Modulation

Source(AMS)”onpage121.

Attack [00...+99]

Thiscontrolstheattacktimeofthesmoother,orhowlongit

takesthesmoothertoreachanew,highervalue.

HigherAttacksettingsmeanlongertimes.

DependingonhowquicklytheAMSinputvalueischang‐

ing,highAttacksettingsmaymeanthatthevalueisnever

quitereached,asshownin“AM S MixerShapeexamples,”

above.

Decay [00...+99]

Thiscontrolsthedecaytimeofthesmoother,orhowlongit

takesthesmoothertoreachanew,lowervalue.

HigherDecaysettingsmeanlongertimes.

Shape

ThisMixerTypeaddscurvaturetotheAMSinput.This

appliesdeformationtotheAMSinput.Youcanusethisto

customizeacontrollercurve,suchastheexponentialcurve

ofthejoystickorthelogarithmiccurveofvelocitycontrol.It

canalsoaltertheshapeofprogrammablemodulation

sources,suchasEGsandLFOs.

Note:ShapeonlyaffectsAMSsignalswhichalreadyhave

someamountofslope,suchasEGs,triangleandsineLFOs,

andsoon.Itdoesnotaffectsignalswhichonlycontain

abrupttransitions,suchassquarewaves.

AMS A Source [List of AMS Sources]

ThisselectstheAMSinputsourcetobeshaped.

ForalistofAMSsources,pleasesee“Alt e r n a t e Modulation

Source(AMS)”onpage121.

Shape [–99...+99]

Thiscontrolstheamountofcurvature,andwhetherthe

curvesareconcaveorconvex.Asyoucanseeinthegraphic

examples,theshapewilltendtoemphasizecertainvalue

ranges,andde‐emphasizeothers.

Forexample,let’ssaythatyouareusingatriangleLFO,

throughShape,tomodulatefiltercutoff.IfShapeempha‐

sizesthehighvaluerange,thefilterwillspendmoretimeat

thehigherfrequencies.Ifitemphasizesthelowrange,the

filterwillspendmoretimeatthelowerfrequencies.

Mode [Symmetric, Asymmetric]

ThisselectswhethertheShapeparameterwillproduceone

ortwocurves.Thegraphic“AMS MixerShapeexam ples”

mayhelptovisualizehowthisworks.

Asymmetricwillproduceasinglecurve,extendingfrom

–99to+99.

Symmetricwillproducetwomatchingcurvesextending

outwardsfrom0to–99and+99,respectively.

Bipolar and Unipolar AMS sources

TounderstandShape,ithelpstounderstandthedifference

betweenbipolarandunipolarAMSsources.

Bipolarsourcescanswingallthewayfrom–99to+99,with

0inthemiddle.MostLFOsarebipolar,forinstance;sois

PitchBend.

Generally,bipolarAMSsourceswillworkbetterwiththe

Asymmetricmode,butSymmetricmayalsoproduceinter‐

estingresults.

Unipolarsourcesonlygofrom0to99,with50inthemid‐

dle.MIDIcontrollers,suchasJS+Y(CC#1),areallunipolar.

Inpractice,EGsareusuallyprogrammedtobeunipolar,

eventhoughtheFilterandPitchEGsdoallowbothpositive

andnegativelevels.

Withunipolarsources,it’salmostalwaysbettertousethe

Symmetricmode.TheAsymmetricmodecancauseoffsets

andotherstrangeresults.

Original AMS A: Smoothing with Long Attack

and Short Release:

Smoothing with Short Attack & Long Release: