Operation Manual

Detailed Program Editing Using Filters
49
Using Filters
Thefiltersallowsyoutodiminishoremphasize
specifiedfrequencyareasofthesound.
Thetoneofthesoundwilldependsignificantlyonthe
filtersettings.
Thebasicfiltersettings,includingtherouting,type,
cutofffrequency,andresonance,aresetontheP3:
Filterpage.
Filter Routing
Eachoscillatorhastwofilters,FilterAandFilterB.The
Routingparametercontrolswhetheroneorbothofthe
filtersareused,andifbothareused,itcontrolshow
theyareconnectedtoeachother.
TheSingleroutingusesonlyFilterAasasingle2‐pole,
12dB/octavefilter(6dBfo
rBandPa
ssandBandReject).
TheSerialroutingusesbothFilterAandFilterB.The
oscillatorfirstgoesthroughFilterA,andthenthe
outputofFilterAisprocessedthroughFilterB.
ParallelalsousesbothFilterAandFilterB.The
oscillatorfeedsbothfiltersdirectly,andtheoutput
sof
thetwofiltersarethensummedtogether.
The24dB/4‐poleroutingmergesbothfilterstocreatea
single4‐pole,24dB/octavefilter(12dBforBandPass
andBandReject).IncomparisontoSingle,thisoption
producesasharperroll‐offbeyondthecutoff
frequency,aswellasas
lightlymoredelicate
resonance.Manyclassicanalogsynthsusedthis
generaltypeoffilter.
SerialandParallelRouting
Filter Types
Thisselectsthepartsofthesoundwhichwillbe
affectedbythefilter,asdescribedbelow.Withthe
SerialandParallelroutings,youcanindependentlyset
thetypesforFilterAandFilterB.
Thefilterswillproduceverydifferentresults
dependingontheselectedfiltertype.Theselections
willchangesli
ghtlyacco
rdingtotheselectedFilter
Routing,toshowthecorrectcutoffslopeindBper
octave.
LowPass.Thiscutsoutthepartsofthesoundwhich
arehigherthanthecutofffrequency.LowPassisthe
mostcommontypeoffilter,andisusedtomakebright
timbressou
nddarker.
HighPass.Thiscutsoutthepartsofthesoundwhich
arelowerthanthecutofffrequency.Youcanusethisto
maketimbressoundthinnerormorebuzzy.
BandPass.Thiscutsoutallpartsofthesound,both
highsandlows,exceptfortheregionaroundthecu
toff
frequency.Sincethisfiltercutsoutbothhighandlow
frequencies,itseffectcanchangedramatically
dependingonthecutoffsettingandtheoscillator’s
multisample.
Withlowresonancesettings,youcanusetheBand
Passfiltertocreatetelephoneorvintagephonograph
sounds.Withhigherresonancesettings,itcancreate
buzzyornasaltimbres.
BandReject
.Thisfiltertype–alsocalledanotchfilter–
cutsonlythepartsofthesounddirectlyaroundthe
cutofffrequency.Trymodulatingthecutoffwithan
LFOtocreatephaser‐likeeffects.
Filter A (Low Pass)Oscillator Filter B (High Pass)
Oscillator
Filter A (Low Pass)
Filter B (High Pass)