2019-07-01_Computer_Music

If one wavetableoscillatorsounds

interesting, twowilldefinitelyexpand

our patch’s sonicpotential.Let’sgotoour

Audio Componentsanddraganother

Wave Table componentin.Weclickthe

centre area of ourfirstWaveTablemodule

so that it turns red,indicatingthatit has

been muted. Now,weselectournewWave

Table componentforediting.

1

WeclickontheParametersbuttonto

bringupourwavetableeditor,then

clickWavetoaccesstheWaveDraw

display.Usingthetechniqueswe

discussedinourprevioustutorialonthe

subject,wedrawina customwaveshape.

WetogglethePlayWaveformswitchto

theRawSamplespositionfora more

vintagetone.

2

Next,weselectWaveIndex 16 , return

totheWaveDrawdisplayandmake

anotherwaveform.Returntothe

Parameterspage,whereweusetheFill

buttontointerpolatebetweenourcustom

waveshapes.Thenrepeattheprocessfor

ouroperandwavetable,settingboth

Indexknobsto 1 andAmountto

somewherebetweenthetwowaves.

3

We select ouroperator’sIndexknob

(the left one)formodulation,thistime

using an LFO as themodulationsource.

We crank the modamountfullysothatthe

LFO sweeps throughthetable.Let’s

increase the PeriodofourLFOforslower

motion, then modulateouroperandIndex

(the right one) ina similarway.

Let’s distinguishoursecondWave

Table oscillatorbyreducingitsPitch

Octave to -1.000. Lovely!Forthatclassic

wavetable synthsound,weneedtoadda

filter to our patch.GototheFiltercategory

in our Audio Components,selectingthe

Ladder Low PassfromtheVirtual

Analog subcategory.WepatchbothWave

Table componentsintoit.

4

7

Ournewoscillator’sgainisa bittoo

static,solet’sbackouttoourSignal

Flow,selectoursecondWaveTable

oscillator,thenclickitsOscillatorbutton

inthelower-left.Onceagain,wemodulate

it withanADSR– thistime,wegofora

lengthierattacktime.Asbefore,we

increasethePeriod.

Let’sassignanEasyADSRtoour

filter’sCutoffFrequency.The

modulationamountshouldbesetto

aroundhalfway,asshouldthefilter’s

CutoffFrequency. Setupa slowAttack

andDecay, lowSustainandlongRelease.

Wealsoincreasethefilter’sResonanceto

around4.8fora bitofsquelch.

5

8

Let’sreturntotheSignalFlow.Here,

weunmuteourfirstWaveTable

componentsothatwecanheara

combinationofbothwhenweplayand

holda note.It soundsprettygood,butour

secondWaveTableoscillatorisa bitloud.

Wecanchangethisbyreducingthe

modulationamountoftheADSRweused

tocontrolitsVolumeparameter.

6

We’vegottimefora finaltouchinthe

formofa pairofeffects.TheDigital

DelayLCRandReverbPromakea sweet

combination,sowerouteourfilter

modulethroughthoseprocessorsand

tweaktheirparameterstotaste.

Obviously,wecoulddoa lotmore– and

weencourageyoutotakethepatcheven

furtheronyourown.

9

Step by step 7. FinishingourFathomCMwavetablepatch

July 2019 / COMPUTER MUSIC / 67

digital modular synthesis with fathom cm / make music now <