SA248 C4 Synth User Guide - Source Audio Website · 2019-08-30 · SA249 C4 Synth User Guide 5...

SA249 C4SynthUserGuide 1

C4 Synth User Guide

Welcome ThankyouforpurchasingtheC4Synth.ThisadvancedpieceofgearoffersallthesoundconstructiontoolsofaclassicEurorackmodularsynthesizerandpackagestheminacompactandeasy-to-useeffectspedalforguitarandbass.ItisessentiallyaEurorackmodularsynthinaboxwithunprecedentedtrackingabilities,lightning-fastresponse,andcountlesssoundoptions.OutoftheboxtheC4offerssixuniqueanddynamicsynthesizereffects.ConnectittotheNeuroDesktopEditororNeuroMobileAppandunlockthispedal’struepower.UsetheNeuroEditorstocreateyourownsynthsoundswithitsclassicEurorackinspirededitinginterfaceorsimplycallupaneffectfromcountlesspresetscreatedbytheSourceAudioteamorthegrowinglegionofC4users.CreateincredibletoneswiththeC4’schoiceoffourparallelvoices,threeoscillatorwaveshapes,ten-plusenvelopefollowers,twenty-plusmodulatingfilters,distortion,tremolo,pitchshifting,intelligentharmonization,programmablesequencingandmore.

Thepedalcomesinacompactanddurablebrushedaluminumhousingwithstereoinputsandoutputs,athree-positiontoggleswitch,asimplefour-knobcontrolsurface,andfullMIDIfunctionalityviaitsUSBport.

TheQuickStartguidewillhelpyouwiththebasics.Formorein-depthinformationabouttheC4Synthmoveontothefollowingsections,startingwithConnections.Enjoy!

- TheSourceAudioTeam


Overview SixPresetPositions:UsetheC4’sthree-positiontoggleswitchandtwopresetbankstosavesixeasilyaccessiblepresets.

GrowingLibraryofPublishedPresets:Forquickaccesstoaworldofgreattones,trysamplingsoundsfromavastcollectionofpublishedpresetscreatedbytheSourceAudioteamandtheever-growingC4NeuroCommunity.

UnprecedentedSoundSculptingOptions:ThepowerfulNeuroDesktopEditor(FreedownloadforMacandWindows)andNeuroMobileApp(iOSandAndroid)offermaximumsoundexplorationpossibilities.UseNeuro’smodularsynthesizerinspirededitortocreatecustomC4Synthpresetsthatcanbeburneddirectlytothepedal,savedtoaprivatecloudbasedlibraryorsharedpublicallywithothermembersoftheNeuroCommunity.

SupremeTracking:Iftrackingmatterstoyou(anditshould),youwillbeamazedbythelightningquick,imperceptiblelatencyoftheC4Synth.

128MIDIAccessibleFactoryPresets–TheadditionofathirdpartyMIDIcontrollerwithUSBhostprovidesaccesstoanyofthepedal’s128Factorypresets.

FourIndependentVoices:MixtogetheranyoftheC4’sfourindependentVoices.AssignanyoftheVoicestoanoscillatorwaveshape,monophonicorpolyphonicpitchshifter,intelligentharmonizer,sequencers,ordrysignaltodistortion,tremolo,andfiltereffects.

ThreeTypesofOscillators:MixandmatchanyoftheC4’sthreeoscillatorwaveshapesforpuresynthesizertones.Choosefromsine,square,andsawshapedoscillators.

ElevenEnvelopeFollowers:Selectfromacomprehensivecollectionofenvelopefollowerswithadjustableattack/decayaswellasADSRtriggeringenvelopes.

25FilterEffects:Choosefromahugecollectionoffilters,controllablewithanenvelopefollowerorindependentlymodulatingLFOs.

14DifferentLFOWaveShapes:UseLFO(LowFrequencyOscillators)tocontrolthemodulationoffilter,vibrato,ortremoloeffects.ChoosefromeightdifferentLFOwaveshapes,includingsine,square,sampleandhold,sawtooth,andmore.

TwoProgrammable16-StepSequencers:Runtwosimultaneoussequencerpatterns.Choosefromseveralpreprogrammedsequencerpatternsorcreatecustompatterns.

StereoInputsandOutputs:UsetheNeuroEditor’spanningcontrolstorouteeachVoicetoanylocationinafullstereospread.

CompactDesign–Thedurable,anodizedaluminumhousinghasasmallfootprintandsturdyhardware.Dimensions:L:4.5in./11.4cmxW:2.75in./7cmxH:2in./5.1cm(includingknobs).

UniversalBypassTM–SelecteitheranalogbufferedorrelaybasedTrueBypass.

USBPort-ClasscompliantUSB-MIDIallowstheC4toworkasaplug-and-playdevicewithrecordingsoftwarerunningonMacandWindowsrecordingsoftwareoranythirdpartyMIDIcontrollerwith


USBhost.TheUSBportalsooffersconnectivitytotheNeuroDesktopEditorprovidingaccesstodeepeditingpossibilitiesandpedalfirmwareupdates.

ExternalExpressionandTapTempoControl—UsetheControlInputjackwiththeSourceAudioDualExpressionPedal(expressioncontroltomultipleparameters)orTapSwitch(adjustLFOratesonthefly).


The C4 Synth: How Does It Work? BeforedivingfullyintotheC4SynthanditsNeuroEditor,itisimportanttounderstandthebasicinternallayoutandsignalpath.BelowisasimpleblockdiagramthatillustratestheC4’sSignalPathandResourceBlocks:

Step1.TheVoices:FirstinlinearetheC4’sVoices(therearefourofthem,hencethename“C4”).AssignedeachactivatedVoicetoitsownSoundSource(Sine,Square,orSawOscillator/MonophonicPitch/PolyphonicPitch/DrySignal).MixtogethermultipleVoicestocreateasingleamazingpreset.

Step2.RoutetheVoices:SendeachVoicetoeitherProcessorPath1(Drive1,Filter1,etc.)orProcessorPath2(Drive2,Filter2,etc.).RouteeachindividualVoicethroughyourdesiredblocks:theDrive,theFilter,ordirectlytotheWetMix.

Step3.ProgramYourResourceBlocks:UsetheResourceblocks(blueblocksinthediagram)todothingslikecontrolFilterModulation,setPitchShiftingintervals,programtheSequencers,andmore.

Step4.SetYourOutputPath:DecidewhichVoicegoestowhichoftheStereoOutputs.


Quick Start Power Topowertheunit,connecttheincluded9VDCpowersupplytothejacklabeledDC9Vonthebackpanel.Whenrunninga3rdpartypowersupply,theC4Synthrequiresanisolated9VDCpowersourcewithaminimumof165mAandacenter-negativeplug.

Warning:Usinganon-SourceAudiosupply,especiallyanunregulatedsupply,coulddamagetheunit.Pleasebeverycautiouswhenusing3rd-partypowersupplies.

Guitar/Audio Connections Usingstandard¼”monocables,connectyourguitar,bass,orotherinstrumenttotheINPUT1jackandyouramp(orthenextaudiodeviceinthesignalchain)totheOUTPUT1jack.Whenrunningastereorig,alsouseInputandOutput2.

Oncethepowerandaudioconnectionshavebeenmade,theC4isreadytoplay.

Brief Knob, Footswitch, and Button Descriptions PleasenotethattheINPUT/SENSandMIX/VOLknobseachcontroltwodifferentparameters.Toaccessthesecondaryparameters(SENSandVOL–printedwithwhitegraphics),presstheALT(AlternativeFunction)buttonlocatedontopofthepedal.UponpressingtheALTbuttontheALTLED(smallLEDonthetopfaceofthepedal)willbegintoblinkindicatingtheaccessibilityoftheAlternateknobparameters.Thesecondaryparameterswillremainaccessiblewhileadjustmentsarebeing


madethenautomaticallyswitchbacktotheprimaryparametersfivesecondsafterthelastknobadjustment.

INPUT/SENSKnob:AdualfunctionknobthatadjuststhelevelofINPUTsignalgoingtotheprocessor,andalsotheSENSITIVITYoftheenvelopefilter.Toaccessthe

• INPUT(thePrimary(Default)Parameter):Adjuststhevolumeleveloftheinputsignal.GiventhereactivenatureoftheC4’spitchdetectorsandenvelopefollowersandthevaryingoutputlevelsofdifferentinstrumentsandtheirpassiveoractivepickups,itisimportanttosetthelevelofsignalgoingtotheprocessor.TheC4alsoincludesasimpleprocessforcalibratingyourinstrumenttotheINPUTlevel(gototheINPUT/SENSEKnobsectionforcalibrationinstructions).

• SENSITIVITY(theAlternateParameter):Adjustshowreactivetheenvelopefilteristotheincomingsignal.Ifyouliketoplayhard,butstillwantasmoother,morerelaxedenvelopefilter,youshouldturndowntheSENSITIVITY.Forasharperresponsetolighterplaying,turnuptheSENSITIVITY.

MIX/VOLKnob:Adualfunctionknobthatadjusttheoverallwet/dryMIXandalsoadjuststheoveralloutputVOLUME.

• MIX(thePrimary(Default)Parameter):Adjuststhebalancebetweenthenaturaldrytoneoftheinstrumentandaffectedwetsignal.A50/50mixofwetdrysignalresidesatroughly12o’clockontheknob.

• VOLUME(theAlternateParameter)AdjuststhemasterVOLUME/Outputofthepedal.KeepinmindthattheoverallVOLUMEwilllikelyvarydependingonthesignaldensityofthepreset.

CONTROL1andCONTROL2:Thefunctionsoftheseknobsvarydependingontheselectedsynthengine.

EffectSelectorToggleSwitch:UsetheC4’sthree-positiontoggleswitchandtwopresetbankstoeasilyaccesssixdifferentpresets.FirstPresetBank(IndicatedbythegreencenterLED):defaultthecentertoggleswitchselectsbetweenthreepresetsstoredinthefirstbankofpresets.SecondPresetBank(IndicatedbytheredcenterLED):PressingtheALTbuttononthetopsideofthepedalopensaccesstothesecondbankofpresets.AfterpressingtheALTbuttonthesmallLEDatthetopofthepedal’sfacewillstarttoblink,indicatingthatthesecondpresetbankisaccessiblewiththetoggleswitch.UponmovingthetoggleswitchthecenterLEDwillturnredindicatingthecurrentpresetisdrawnfromthesecondbank.

Footswitch:Enablesorbypassestheeffect.Also,pressingandholdingthefootswitchfromthebypassedstatetogglesbetweenthefirstandsecondpresetbanks.

ALT(AlternateFunction)Button:ThesmallblackbuttonlocatedonthetopsideofthepedalnexttotheCONTROLINPUTjack.PressingtheALTbuttontemporarilyputsthepedalintoAlternateControlMode(indicatedbytheblinkingtopcenterLED).AlternateControlModeswitchesfromthePrimarytoSecondaryfunctionoftheINPUT/SENSandMIX/VOLknobs.AlsomovingthecentertoggleswitchwillswitchbetweentheGreenandRedPresetBanks(gotothePresetBankssectionformoreinfo).


Contents Welcome................................................................................................................................................1

Overview................................................................................................................................................2

TheC4Synth:HowDoesItWork?..........................................................................................................4

QuickStart..............................................................................................................................................5

Connections............................................................................................................................................8

Controls................................................................................................................................................11

AccessingtheGreenandRedPresetBanks.........................................................................................14

ThreeDifferentPresetModes..............................................................................................................14

UniversalBypassTM..............................................................................................................................15

ExternalControl....................................................................................................................................16

NeuroMobileApp&NeuroDesktopEditor.........................................................................................19

Browse,Burn,andPlay!!......................................................................................................................19

TheNeuroDesktopEditor....................................................................................................................19

Daisy-ChainingNeuroCommunication................................................................................................39

MIDIThroughtheUSBPortorNeuroHub...........................................................................................41

C4SynthSpecifications.........................................................................................................................43

Troubleshooting...................................................................................................................................44

FrequentlyAskedQuestions.................................................................................................................45

RubberFeet..........................................................................................................................................46

WasteDisposalNotes...........................................................................................................................46

Warranty..............................................................................................................................................47

VersionHistory.....................................................................................................................................48


Connections Input Side Connections

Input 1 Thisistheprimaryinputforguitar,bass,orotherinstruments.Itcanalsoacceptline-levelinputsofupto+6.54dBV/8.76dBu.Connectittoyourinstrumentorotheraudiosourceusingamono(TS)¼”cable.

Input 2 Input2actsaseitherasecondaudioinput,thedataconnectionfortheNeuroMobileApp,oraninputforbothaudioandNeuroDatasimultaneously.

Input 2 as an Audio Input ThetipcontactonInput2actsasasecondaryinputforguitar,bass,orotherinstruments.ItisonlyactivewhentheC4isconfiguredwithasignalroutingoptionthatusesstereoinputs.Connectittoyourinstrument(orthepreviouseffectinthesignalchain)usingamono(TS)¼”cable.Bydefault,theC4willauto-detecttheroutingmode.OtherroutingoptionsareavailableusingtheNeuroMobileApporDesktopEditor.Formoreinformationaboutstereorouting,refertotheI/ORoutingOptionssection.

Input 2 as a Neuro App Data Input TheringcontactonInput2actsasadataconnectionfortheNeuroApp.Connectittoyourmobiledeviceusingastereo(TRS)¼”cable.Itcanalsoacceptsimultaneousaudioanddaisy-chainedNeurodatafromanotherNeuro-compatiblepedalinthechain,providedthataTRScableisused.Theaudiosignal(ifapplicable)willbeonthetipcontactoftheplug,andtheNeuroAppdatawillbeontheringcontact.

Input2acceptsdatafromtheNeuroMobileApp.DatafromtheNeuroHubcomesthroughtheCONTROLINPUTport.


Output Side Connections

Output 1 ThisistheprimarymonoOutput.ConnectthisOutputtoyouramplifier,recordinginterface,orthenextdeviceinyoureffectssignalchainusingamono(TS)¼”cable.

Output 2 Actsaseitheranaudiooutput,thedaisy-chaindataconnectionfortheNeuroApp,orbothaudioandNeuroDatasimultaneously.

Output 2 as an Audio Output ThetipcontactonOutput2actsasthesecondaryaudiooutput.ItcarriesanaudiosignalwhentheC4isconfiguredwithasignalroutingthatusesstereooutputs.Connectittoyouramplifier,recordinginterface,orthenextdeviceinyoureffectssignalchainusingamono(TS)¼”cable.

Output 2 as a Neuro App Data Daisy-Chain Output TheringcontactonOutput2actsasadataconnectionfortheNeuroApp,passingdatafromtheC4tothenextSourceAudioeffectinyoursignalchain.Youcandaisy-chaintheNeuroAppdataregardlessofwhetherOutput2isconfiguredtooutputaudioornot.ConnectOutput2tothenextpedal’sNeuroAppDatainput(Input2)usingastereo(TRS)¼”cable.Theaudiosignal(ifapplicable)willbeonthetipcontactoftheplug,andtheNeuroAppdatawillbeontheringcontact.SeetheDaisy-ChainingNeuroCommunicationsectionformoreinfo.


Power and Control Connections

DC 9V (Power) Connecttotheincluded9VoltDCpowersupply.Thepowersupplymustberegulatedat9Volts(directcurrent),abletosourceatleast165mA(milliamps)ofcurrent,andtheplugshouldhaveatip-negative,sleeve-positivepolarity(thecentertipisgroundandthesleeveispower).

USB Connectyourcomputer(MacorWindows)totheC4’sUSBport(denotedbythe icon)usingastandardminiUSBcable.TheUSBporthandlescommunicationbetweenthepedalandtheNeuroDesktopEditororadigitalaudioworkstation(DAW).TheC4willalsorespondtoMIDImessagesfromanexternalMIDIControllerwithUSBhostsupport.TheC4isaclasscompliantUSBdevice,meaningthatMacandWindowscomputerswillrecognizeitautomatically.FormoreinformationabouttheC4’sUSBcapabilities,refertotheUSBsectionoftheUser’sGuide.

CONTROL INPUT Port The3.5mmCONTROLINPUTPortconnectstoexternalcontroldevicessuchastheSourceAudioExternalTapSwitch,DualExpressionPedal,NeuroHub,andHotHand3MotionController.Formoreinformation,refertotheExternalControlandNeuroHubsectionsoftheUserGuide.

ALT (Alternate) Button Thesmallblackbuttonlocatedonthetopsideofthepedal,nexttotheCONTROLINPUTjack.PressingtheALTbuttontemporarilyputsthepedalintoAlternateControlMode(indicatedbytheblinkingtopcenterLED).AlternateControlModeswitchesfromthePrimarytoSecondaryfunctionoftheINPUT/SENSandMIX/VOLknobs.AlsomovingthecentertoggleswitchwillswitchbetweentheGreenandRedPresetBanks(gotothePresetBankssectionformoreinfo).


Controls

Knobs ALT (Alternate) Button ThesmallblackbuttonlocatedonthetopsideofthepedalnexttotheCONTROLINPUTjack.PressingtheALTbuttontemporarilyputsthepedalintoAlternateControlMode(indicatedbytheblinkingALTFunctionLED).AlternateControlModeswitchesfromthePrimarytoSecondaryfunctionoftheINPUT/SENSandMIX/VOLknobs.AlsomovingthecentertoggleswitchwillchangethePresetBank.TherearetwoPresetBanksthefirstisindicatedbyagreencenterLED,thesecondisindicatedbyaredcenterLED.

INPUT/SENSE AdualfunctionknobthatadjuststheleveloftheINPUTlevelsignalgoingintotheprocessorortheSENSITIVITYoftheenvelopefilter.SeetheALT(Alternative)ButtonsectionaboveforinstructionsonaccessingtheSecondaryParameter.

• INPUT(Primary(Default)Parameter):Adjuststhevolumeleveloftheinputsignal.GiventhereactivenatureoftheC4’spitchdetectorsandenvelopefollowersandthevaryingoutputlevelsofdifferentinstrumentsandtheirpassiveoractivepickups,itisimportanttosetthelevelofsignalhittingthepedal’sprocessor.Forhotter,activepickupsitisprobablybestto


turntheINPUTknobdown.FortraditionalpassivepickupsitwillhelptoturntheINPUTlevelup.

o INPUTCALIBRATIONFUNCTION:WehaveprovidedauniqueInputCalibrationFunctiontoassurethatyouaregettingthebestpossibleinteractionbetweenyourinstrumentandtheC4.TheCalibrationprocessisasfollows:

1. TurntheINPUTknoballthewaydown.2. Continuouslypluckyourinstrumentatyouraveragepluckingvelocity.3. SlowlyturnuptheINPUTknobupuntilthecenterLEDstartsflashingred.

ThisflashingindicatesthatyouhavereachedtheoptimumINPUTlevel.Leavetheknobwhereitis–theprocessiscomplete.

• SENSITIVITY(SecondaryParameter).Adjustshowreactivetheenvelopefilteristotheincomingsignal.Ifyouliketoplayhard,butstillwantasmoothermorerelaxedenvelopefilter,youshouldturndowntheSENSITIVITY.Forasharperresponsetolighterplaying,turnuptheSENSITIVITY.

MIX/VOL Adual-functionknobthatadjustthewet/dryMIXandtheoveralloutputVOLUME.

• MIX(Primary(Default)Parameter):Thewet/dryMIXcontroladjuststhebalancebetweenthenaturaldrytoneoftheinstrumentandaffectedwetsignal.A50/50mixofwetdrysignalresidesatroughly12o’clockontheknob.Fora100%wetsignalturntheknobfullyclockwise-fora100%drysignalturntheknobfullycounter-clockwise.

• VOLUME(SecondaryParameter):AdjustsoveralloutputVOLUMEofthepedal.BeawareofthattheoverallVOLUMEwilllikelyvarydependingonthesignaldensityofthepreset,somakesuretoA/BtestthelevelsbetweenyourbypassedandengagedsignalsandadjusttheVOLUMEaccordingly.

CONTROL 1 & 2 Thefunctionsoftheseknobsvarydependingontheselectedsynthengine.UsetheKnobAssignmentsectionoftheC4NeuroSoundEditortolearnwhichparameterhasbeenassignedtotheCONTROL1andCONTROL2knobs.

Effect Toggle Switch UsetheC4’sthree-positiontoggleswitchandtwopresetbankstoeasilyaccesssixdifferentpresets.FirstPresetBank(IndicatedbythegreencenterLED):bydefaultthecentertoggleswitchselectsbetweenthreepresets(Circle,Triangle,Square)storedinthefirstbankofpresets.SecondPresetBank(IndicatedbytheredcenterLED):PressingtheALTbuttononthetopsideofthepedalinitiatesablinkingpatternfromthesmallLEDonthepedal’sface,indicatingthatthesecondpresetbankisaccessiblewiththetoggleswitch.UponmovingthetoggleswitchthecenterLEDwillturnredindicatingthecurrentpresetisdrawnfromthesecondbank.Followthesameprocesstoswitchbacktothegreenbank.

ALT Button (Alternate Function) ThisisasmallblackbuttonlocatedonthetopsideofthepedalnexttotheCONTROLINPUTjack.PressingtheALTbuttontemporarilyputsthepedalintoAlternateControlMode(indicatedbythe


blinkingtopcenterLED).AlternateControlModeswitchesfromthePrimarytoSecondaryfunctionoftheINPUT/SENSandMIX/VOLknobs.MovingthetoggleswitchwhilethepedalisinAlternateControlModewillswitchbetweenthegreenandredpresetbanks.

LEDs Engage / Bypass LED TheEngage/BypassLEDabovethefootswitchindicatesiftheeffectisactive(lit)orbypassed(notlit).ThecolorofthisLEDindicateswhetherthecurrentpresetisstoredinthefirstbank(greenLED)orthesecondbank(RedLED).

TheEngage/BypassLEDalsoplaysarolewhencalibratingtheINPUTlevel.GototheINPUT/SENSEKnobsectionofthismanualforinstructionsoncalibratingtheINPUTlevel.

Alternate Function LED ThesmallLEDlocatedbetweentheINPUTandMIXknobsistheAlternate(ALT)ParameterLED.PressingtheALTbuttonputstheC4intoAlternateParametermode,indicatedbytheblinkingLED.Ifaperiodof6secondspasseswithoutmovinganyknobsorthetoggleswitch,theAlternateParameterLEDwillstopblinkingandtheknobswillreturntotheirprimaryparameter.

TheAlternateFunctionLEDalsoindicates(whenlitsolid/notblinking)thatexternalcontrolmode(expression,hothand,orMIDI)isactive.

Footswitch Enablesorbypassestheeffect.Thefootswitchisalsousedtotogglebetweenthefirst(greenLED)andsecond(redLED)PresetBanks.GototheAccessingtheGreenandRedPresetBankssectionofthismanualformoreinfoonchangingPresetBanks.


Accessing the Green and Red Preset Banks TheC4canstoreuptosixpresets(2banksof3presets)accessiblewithoutaMIDIcontrollerortheNeuroEditor.

• GreenPresetBank(IndicatedbythegreencenterLED):Bydefaultthecentertoggleswitchselectsbetweenthreepresets(Circle,Triangle,Square)storedinthefirst(green)bankofpresets.

• RedPresetBank(IndicatedbytheredcenterLED):PressingtheALTbuttononthetopsideofthepedalinitiatesablinkingpatternfromthesmallLEDonthepedal’sface,indicatingthatthesecondpresetbankisaccessiblewiththetoggleswitch.UponmovingthetoggleswitchthecenterLEDwillturnredindicatingthecurrentpresetisdrawnfromthesecondbank.Followthesameprocesstoswitchbacktothegreenbank.Also,pressingandholdingthefootswitchfromthebypassedstatetogglesbetweenthefirst(Green)andsecond(Red)presetbanks.Note:if“QuickBankSwitchUsingFootswitch”hasbeenselectedfromtheNeuroEditor’s“C4SynthHardwareOptions,”itisalsopossibletochangepresetbankswiththefootswitchwhilethepedalisstillengaged.

Three Different Preset Modes ConnectingtheC4SynthtotheNeuroDesktoporNeuroMobileApp(SeetheNeuroSectionformoreinfo)allowsyoutoselectbetweenthreedifferentPresetModes:Standard(Default),Preset,andWYSIWYG(“WhatYouSeeIsWhatYouGet”).ToselectwhichmodeyourC4operatesunder,gotheC4’sHardwareOptionsMenu(theC4geariconintheConnectionsection)andusethePreset/WYSIWYGmenu.Eachmodeisuniversalappliestoallsixpresetsavailableinthegreenandredpresetbanks.

Standard (Default) Mode InStandardModeeachpresetengageswithapre-programmedpreset,meaningthephysicalpositionsoftheknobsdonotaffectthesoundofthepreset.Itis,however,possibletoreachdownandmakeknobadjustmentsonthefly.If,aftermakingaknobadjustment,thepedalisbypassedthenreengagedwithoutmovingthetoggleswitch,thesoundwillcontinuetoreflectthenewknobpositions.Ifthetoggleswitchismoved(regardlessofwhethertheeffectisengagedorengaged),thepedalwillreverttotheparametersettingsofthesavedpreset.

Preset Mode PresetModeworkssimilartotheStandard(Default)Modewithonekeydifference,itallowsyoutore-savethepresetaftermakingknobadjustments.Soupontheinitialengagementofapresettheknobparameterswillinstantlyjumptotheirsavedvalues,regardlessofthephysicalpositionoftheknobs.However,ifyoudomakeaknobadjustment,thecenterLEDwillstarttoblink,indicatingthateditshavebeenmade.AftermakinganadjustmentyoucansavethenewsettingsbypressingandholdingthefootswitchuntilthecenterLEDstopsblinking(aroundfiveseconds).


WYSIWYG (What You See Is What You Get) Mode InWYSIWYGModetheC4functionsmuchlikeatraditionaleffectspedal.Itisa”WhatYouSeeIsWhatYouGet”experience,meaningthatthecurrentphysicalpositionsoftheknobswillindicatethesettingsoftheprimaryknobfunctions.Note:Ifyoumovethetoggleswitchtoanewpositionalltheprimaryknobparameterswillmaintainthesettingsofthephysicalknobpositions,butthesecondaryknobfunctions(SENSITIVITYandVOL)willreverttotheirdefaultsettings.

Universal Bypass TM Mosteffectpedalsoffereithertruebypassorbufferedbypass.TheC4Synthcontainstwoseparatecircuitsforbypassmode,allowingyoutochoosethemethodyouprefer.Thetruebypasspathusessignalrelays,whichareelectromechanicalswitches.Thisprovidesanultra-lowresistancepathfromtheinputjackstotheoutputjacks,whichiseffectivelythesameasasinglewire.Thebufferedbypasspathusesextremelylownoisebuffers,whichprovideverylowoutputimpedanceandareeffectivefordrivinglongcablesorlongchainsofeffectsfollowingtheC4’saudiooutput.

Outofthebox,theC4operatesintruebypassmode.Toselectadifferentbypassmode,opentheC4’sHardwareOptionsmenuintheNeuroMobileApporDesktopEditor,thenselectanoptionfromthe“HardwareBypassMode”pulldownmenu.

Werecommendusingthebypassmethodbestsuitedforyoursignalchain.Ideally,thefirstpedalinasignalchainisabufferedinputfollowedbytruebypassintherestofthesignalchain.

Bothbypassmethodshaveprosandconsassociatedwiththem.Bufferedbypassprovidesconsistentinputimpedancesothatifthesourceissusceptibletovariationsininputimpedance(similartoaguitarpickup),therewon’tbeanoticeablechangeintone.Truebypasshasthebenefitofprovidingadedicatedhardwiredbypasssignalpath.TheC4featuressmall-signalrelaysfortruebypassswitchingthatofferreducedpopsandclickscomparedtothetraditionaltruebypassswitchingmethodusingamechanicalswitch.


External Control

TheCONTROLINPUTportopensavarietyofexternalcontroloptions,allowingfordirectcontrolovermanyoftheC4’sparameters.Itisaninputforthe,SourceAudioTapSwitch,SourceAudioDualExpressionPedal,oradataportfortheNeuroHub.

The Source Audio Tap Switch TheSourceAudioTapSwitchconnectsdirectlytotheCONTROLINPUTwitha1/8”TRRScable.TheTapSwitchcanbeusedforavarietyoftasks.

• TapTempo:ManuallytapintherateoftheLFO.UsetheBeatDivisionpull-downmenuintheLFO1&2blockoftheNeuroEditortoselecttherhythmicsubdivisionofthetaptempo.ThebeatdivisionoptionsareWhole,Half,Quarter,Eighth,Triplet,andSixteenthnotes.

Expression Pedals TheC4’seffectsparameterscanbecontrolleddirectlybyaSourceAudioDualExpressionPedalortheHotHand3WirelessControllerconnectedwitha1/8”TRRScabletotheCONTROLINPUTport.

SourceAudio’sexpressionpedalsareconfiguredasfollows:thetipconnectionispower,thefirstringistheX-axisexpressionsignal,thesecondringistheY-axisexpressionsignal,andthesleeveconnectionisground.

Ground Power

YExp XExp


AlthoughtheCONTROLINPUTportexpectsa4-contactTRRSplug,itisstillpossibletousea3rdpartyexpressionpedalwitha3-contactTRSplug(Note:youshouldmakesuretheexpressionpedal’sTRSconfigurationisthesameasthegraphicbelow).Usea3-contact1/4”to1/8”(3.5mm)TRSplugconverter-theexpressionpedal’soutputwillbeconnectedtotheC4’sX-axis.Forproperoperation,theconfigurationstepsinthenextsectionmustbefollowedwhenusinganyexpressionpedal,whetherfromathirdpartyorfromSourceAudio.

ExpressionpedalswithTS(TipSleeve)plugswillnotworkcorrectlywiththeC4.

Theresistance/impedanceoftheexpressionpedaldoesnotmatter.TheC4willautomaticallyadjustitselftotherangeoftheexpressionpedalwhenitisconfigured.

Configuring the Expression Pedal UsetheC4Synth’sNeuroSoundEditortoassignexpressioncontroltouptothreeparameters.ExpressioneditingisaccomplishedintheExternalControlblockoftheNeuroSoundEditor.FormoreinfoonassigningexpressioncontroltotheC4gototheExternalControlsectionofthismanual.

Hot Hand 3 Universal Wireless Controller TheHotHand3WirelessEffectsControllerconnectsdirectlytotheC4’sControlInputwitha1/8”TRRScableandcanbeusedtocontroluptothreeparameters.HotHand3workssimilarlytoanexpressionpedal,butratherthanrockinganexpressiontreadletomoveparameters,HotHandmovesparameterswithhandmotionsviaitswirelessring.VisittheHotHand3PageontheSourceAudiowebsiteformoredetailsonHH.TheHotHandhastwoaxesofexpression:XandY.ThesesignalsarecarriedonthetworingsoftheTRRScablethatcomesfromtheHotHandreceiver.

Ground Power

Express ion

Ground Power

YExp XExp


Configuring the Hot Hand UsetheC4Synth’sNeuroSoundEditortoassignHotHandcontroltouptothreeparameters.HotHandexpressioneditingisaccomplishedintheExternalControlblockoftheNeuroSoundEditor.FormoreinfoonassigningexpressioncontroltotheC4gototheExternalControlsectionofthismanual.


Neuro Mobile App & Neuro Desktop Editor TheC4Synthwasdesignedtobeasimpleplug-and-playeffectspedal.Straightoutofthebox,theC4offerssixgreatsoundingguitar/basssyntheffects,butconnectingtheC4totheNeuroMobileAppandNeuroDesktopEditoravastLibraryofeasy-to-accessPresetscreatedbytheSourceAudioteamandtheever-growingcommunityofC4Synthusers.TheNeuroEditoralsooffersasuper-powerfulSoundEditorforcreating,saving,andsharingyourowncustomPresets.

Browse, Burn, and Play!! It’sjustthateasy.Ifyoudon’thavetimetodiveintotheSoundEditor,butyouwantaquicklistentothevastlandscapeofsoundstheC4hastooffer,simplyjumptotheCloudandcheckoutalltheavailableUserPresets.Whenyoufindsomethingyourlove,simplyhittheBURNbuttonanduploadthatPresetdirectlytoyourC4andbringittothenextgig.FormoreinfoonBurningPresetstoyourC4gototheCloudsectionofthismanual.

The Neuro Desktop Editor TheNeuroDesktopEditorisanexcellenttoolforaccessing,creating,andorganizingPresetsforyourC4Synth.TheDesktopoffersanexpandedcollectionofdeepeditingparameters,andanadvancedcatalogingsystemfornamingandstoringC4presets.TheDesktopisalsoatoolforinstallingthelatestupdatestoyourC4Synthfirmware.

Downloading and Connecting the Neuro Desktop Editor TheNeuroDesktopEditorisafreedownloadforMacandWindowsPCs.TodownloadtheNeuroDesktop,gototheSourceAudioDownloadspage.IntheSoftwaretabclickanddownloadtheappropriatefile.ThelatestfirmwareversionsfortheentirelineofOneSeriespedals,includingtheC4Synth,areincludedwiththeNeurodownload.Ifthereistroubleinstallingthesoftware,selectSystemPreferences//SecurityandPrivacy//OpenAnyways.

Afterthedownloadingprocess,opentheNeuroDesktopEditorandconnectyourC4SynthwithaUSBTypeAmaletominiTypeBmaledatacable(Warning:don’tuseachargercable).ConnectthecablefromtheminiUSBportonthepedaltotheUSBportonyourcomputer.Onceyou’vemadethe


connectionablueboxwillappearintheConnectionsfieldoftheNeurointerfaceindicatingthattheC4isreadyforediting.

IfyourC4Synthisinneedofafirmwareupdate,theFirmwareUpdateicon(thearrowicon)willbeframedinyellow.Uponclickingthearrowicon,youwillbeinstructedontheupdatingprocedure.(Note:ItisimportantdisconnectallotherSourceAudiopedalsandturnoffMIDIsoftwareduringthefirmwareupdatingprocess.)

Neuro Desktop Editor User Interface TheNeuroDesktop’suserinterfacefeaturesthreeprimarysections:Connections,PresetEditor,andPresets.


Connections TheConnectionssectionislocatedontheleftsideoftheNeuroDesktopEditor.ThisfielddisplaysallconnectedOneSeriespedals.Eachconnectedpedaloffersthethreeoptionslistedbelow:

• FirmwareUpdates(ArrowIcon):Clicktodownloadanyrecentfirmwareupdatestotheconnectedpedal.Ifanupdateisavailablethisiconwillbeframedinyellow.Uponclickingtheicon,thesoftwarewillprovideinstructionsonhowtoproceed.

• HardwareOption(GearIcon):OpenstheHardwareOptionswindow.EachSourceAudiopedalhasitsownsetofglobalhardwaresettings.Theattachedpedalwillretainallhardwareoptioneditsuntileithertheoptionisde-selected,oraFactoryResetisperformed.

• SoundEditor(WrenchIcon):OpenstheC4Synth’sSoundEditor,revealingadeepsetofeditingcontrolsforcreatingcustompresets.


Hardware Options ClickingthegeariconintheC4Synth’sConnectionswindowopenstheHardwareOptionsmenu(seethegraphicbelow).UsetheHardwareOptionswindowtochooseyourpedal’sglobalhardwaresettings.

TheC4Synth’sHardwareOptionsincludethefollowing:

• Preset/WYSIWYG:TherearethreedifferentPresetModesavailableintheC4:Standard(Default),Preset,andWYSIWIY(“WhatYouSeeIsWhatYouGet”).UsethisdropdownmenutoselectthePresetMode.Formoreinfoonthefunctionalityofeachmode,gototheThreeDifferentPresetModessection.

• Hardware:SelectsbetweentwoHardwareBypassModes:TrueBypassorActiveAnalog(Buffered)Bypass.

• MIDIChannel:Selectsthepedal’sMIDIchannel(1through16).• ControlInputOption:SelectsthefunctionoftheexternaldeviceconnectedtotheCONTROL

INPUTport.Optionsinclude:o NeuroHub/ExpressionPedal:EnablescompatibilitywiththeNeuroHub(which

providesfullMIDIfunctionality)oranexternalExpressionPedal(seedetailsintheExternalControlsection).

o TapTempo:ConnecttheSourceAudioTapTempoSwitchtotheTrueSpringandsyncitstremolorateswithexternaltaptempocontrol.

• ExternalLoopSafeMode:CheckthisboxwhenusingthePre-ProcessingExternalLooproutingoption.Itwillpreventyoureffectfromfeedingbackwhenengaged.

• PowerUpState:SelectswhethertheC4isEngagedorBypassedduringtheinitialpower-upprocess.


• DefaultInput:SelectsthedefaultconfigurationoftheInputjacks.Therearefourdifferentoptions:AutoDetect(Default),SingleInput1,DualInput1&2,ExternalLoop(Pre-Processing).GototheRoutingandOptionssectionfordetailsonalloftheroutingchoices.

• QuickBankSwitchUsingFootswitch(2Seconds):BydefaultyoucanonlyusethefootswitchtoalternatebetweenPresetBank1(GreenLED)andPresetBank2(RedLED)fromthedisengagedstate.CheckingthisboxallowsyoutoalternatePresetBanksquickerANDfromtheengagedstate.

• USBMIDISkipPowerCheck:TheC4canreceiveMIDIPCmessagesviathepedal’sUSBport.ItrequiresMIDIDAWsoftwareoraMIDIhostdevicewithUSB.TheC4shouldrespondtomostdevices,butsomedon’tgenerateenoughpowerfortheC4torecognizethemasaMIDIhost(theMIDIBabyandqCONNECTfromDisasterAreaDesignsaretwoexamples).IfyourC4isnotrespondingtoyourMIDIhostdevice,trycheckingthisbox.

• ShowExpressionPedalCalibration:Ifnecessary,openthiscontrolsettocalibrateexternalexpressionpedals.

Preset Editor ClicktheSoundEditor(wrench)iconintheConnectionssectiontoopentheC4Synth’sSoundEditorinthecentertab.Thisiswhereallofthesoundeditingworktakesplace.TheSoundEditorisbrokenintoseveralsub-sections,eachcontainingauniquevarietyofvirtualknobsanddropdownmenus.ThefollowingisabriefexplanationofeachSoundEditorsub-section.

Master Controls

ThecontrolsthatpopulatetheMasterControlssectionapplytoallfourVoicesintheC4Editor.

• Input1Gain1&Input2Gain:BecausetheC4’spitchdetectorandenvelopefollowersresponddifferentlydependingonthelevelofsignalgoingintothepedalandbecausetheoutputlevelsofdifferentinstrumentsvarysogreatly,itcanbehelpfultoadjustthelevelofsignalgoingintotheeffectsprocessor.ThetwoInputGaincontrolsmakeitpossibletoadjustthelevelfromInputs1&2independently.

• MasterDepth:AmastercontrolforthemodulationdepthofFilter1andFilter2.WhenrunningbothfilterssimultaneouslytheMasterDepthcontroladjustthedepthofbothfiltertoscalewiththeirindividualsettings.

• ModSource(ENV/LFO):Adjuststhemixtureofthemodulationsource.Themodulationsourcereferstothemechanismthatmoves(a.k.a.“modulates”)thefilters.TheC4hastwotypesoffiltermodulation:theenvelopefollower(ENV)movesthefilterbasedontheplayerspickattack,andthelowfrequencyoscillator(LFO)modulatesthefilterbackandforthata


steadyratesetbytheSpeedcontrolintheLFOandArpeggiatorsection.Turningtheknoballthewaytotheleftprovides100%envelopefollowercontrolandturningtheknoballthewaytotherightprovides100%LFOcontrol.Settingtheknobanywhereinbetweencreatesamixtureofbothtypesoffiltermodulation.

• Bass:Boostsorcutsthelowfrequenciesofthewetsignal.• Treble:Boostsorcutsthehighfrequenciesofthewetsignal.• Mix:Setstheratiobetweenthewetanddrysignal.Placingtheknobatapproximately12

o’clockcreatesa50/50mixtureofwetanddrysignal.• LoRetainFrequency:RatherthanasimpleMixcontroltheLoRetainparameterallowsyouto

splitthefrequencyspectrumofyourwetsignal,meaningthattheC4effectappliesonlytothefrequenciesaboveacertaincut-offpointandleavesthelowerfrequenciesdryandunaffected.TheLoRetainFrequencyadjuststhepointinthefrequencyspectrumwherethissplitoccurs.Asweturnthisknobfromlefttorightthecut-offpointmovestohigherfrequenciesleavingmoreandmoreofyourlowfrequencyspectrumunaffected.

• OutputVolume:Boostsorcutstheoveralloutputlevelofboththewetanddrysignals.• OutputBalance:BalancesthelevelofthewetsignalsgoingtoOutput1(Left)andOutput2

(Right).Settheknobto12o’clockforanevenstereosplittobothOutputs.TurningtheknobleftshiftsthebalancetoOutput1andturningtheknobrightshiftsthebalancetoOutput2.

Voice Controls

TheC4featuresfourindividualVoices.AssigneachVoicetoanyoneofthepossibleoptions:Sine,Square,orSawWaveOscillator,MonophonicPitchShifter,PolyphonicPitchShifter,orthedrysignalrouteddirectlytotheenvelopefiltersand/ordistortionblock.MixtogetheranycombinationwitheachVoice’sdedicatedLevelandPanControls.AllfourVoicemodulesfeaturethesamecontrolset.

• On:ClicktheOnbuttonstoengageordisengageeachindividualVoice.IftheOnbuttonisgreentheVoiceisengaged.

• SourcePull-DownMenu:SelectsthetypeofaudioSourceassignedtotheeachindividualVoice.EachSourcemayonlybeusedoncewithineachpreset.TheSourceoptionsareasfollows:

o StereoInputMix:RoutesboththeInput1&2signalsdirectlytotheenvelopeanddistortionblockswithoutapplyingpitchshiftingoroscillatoreffects.

o PolyphonicPitch1and2:RoutesthedrysignalthroughthePolyphonicPitchshiftingmodule.WiththePolyphonicPitchshiftingmoduleitispossibletoplaychords.UsetheIntervalpull-downmenutoselectanyintervaluptothreeoctavesaboveorbelowtherootnotes.


o MonophonicPitch1and2:RoutesthedrysignalthroughtheMonophonicPitchshiftingmodule.TheMonophonicPitchShifterappliespitch-shiftingeffectstosinglenotelines(a.k.a.“notchords”).UsetheIntervalpull-downmenutoselectanintervalupordownthreeoctaves.SelectingtheHarmonyoptionfromtheIntervalpull-downmenuallowsforintelligentharmonization–choosethekeyandscaleintheHarmonyblock.

o Saw1&2:AtrueSawWaveOscillatorsynthesizerVoice.TheSawwaveoffersabrightandbuzzysynthtonerichinharmoniccontent.AllofthesynthVoicescanberunwithanyIntervalorIntervalMode.TheycanalsobeusedwiththeSequencers.

o Sine1&2:Thesimplestofthewaveshapeoscillators.Sinewaveoscillatorscreateaverypuresynthesizertonewithnoadditionalharmoniccontentorbuzzingcharacteristics.

o Square1&2:Anotherbrightoscillatorwaveshape.TheSquareWaveOscillatoreliminatingalltheevenorderharmonics,whichgivesititscharacteristic“hollow”synthesizertone.

o MonoInput1&2:Routesdrymonoinputsignalstotheenvelopeanddistortionblocks.

• EnvelopePull-DownMenu:ChooseswhethertheVoice’samplitudemodulationiscontrolledbyEnvelope1,Envelope2,orbypassed(EnvelopeOff).

• OctavePull-DownMenu:Appliesanoctave-shiftingeffecttoanyoftheSaw,Sine,andSawWaveOscillatorsorthePolyphonicandMonophonicPitchShiftingVoices.Choosefromintervalsupordownthreeoctaves.

• SemitonePull-DownMenu:AddsadditionalsemitonestotheoctaveselectedfromtheOctavePull-Downmenu.Eachsemitone=a½steppitchshift.

• IntervalModePull-DownMenu:SelectsbetweenthreedifferentIntervalModes.o FixedInterval:Theintervalremainsfixedbetweentheplayednoteandtheinterval

setintheIntervalPull-Downmenus.o Harmonization:Appliesintelligentharmonizationbetweentheplayednoteandthe

intervalssetintheHarmonymodulefurtherdowntheEditinginterface.UsetheHarmonymoduletoselectakeypairedwithanyofover20differentscales.UnliketheNormalfixedpitchInterval,theHarmonizationpitchintervalsfluctuatetoadherewiththeselectedkeyandscale.PleasenoteInterval1setstheintervalforVoicesassignedtoaSourcelabeledwitha“1”(ex.Square1,Sine1,Saw1).Interval2setstheintervalforVoicesassignedtoasourcelabeledwitha“2”(ex.Square2,Sine2,Saw2).

o Sequencer:TheC4canrunoneortwosimultaneoussequencerpatterns.SelecttheSequenceroptionandchoosefromtheSourceAudiocollectionofSequencerpatternsorcreateyourownCustomSequencesinthemoduleslocatedfurtherdownintheEditor.PleasenotethatVoices1&3areroutedtoSequencer2andVoices2&4areroutedtoSequencer1.

• LevelKnob:SetstheOutputlevelofthecorrespondingVoice.UseeachVoice’sdedicatedLevelknobsasafour-channelmixerforthefinalpreset.

• ProcessorPanKnob:DirectseachVoice’ssignaltoeitherProcessor1ontheleftsideoftheknoborProcessor2ontherightsideoftheknob.


• Tremoloknob:EachVoice’sdedicatedTremolocontrolsetsthatVoice’sindividualtremolodepth.TherateofalltheVoices’tremoloeffectsaresyncedtothetremolowaveshapeandSpeedknobintheLFOModulelocatedfurtherdowntheEditor.

• LFODropdownMenu:SelectswhetherthetremoloeffectrespondstoLFO1or2.• DetuneKnobandModulateButton:UsetheDetuneknobtoadjusttheVoice’spitcheither

upordown.SelecttheModulatebuttonbelowtheDetuneknobandassigntheeffecttotheLFO1.TheLFO(selectableintheLFO1&2block)continuouslybendsthepitchbackandforthbetweentheoriginalanddetunedpoints.Usethesubsequentpitchmodulationtocreateeithersubtlemovementoramoreintensevibratoeffect.MixoneDetunedvoicewithanotherUn-DetunedVoiceandcreateachorusordoublingeffect.

• FMKnob:AdjuststheFMsynthesis.FMsynthesisappliestoSineWaveOscillatorsonly.FMsynthesisusesanaudiofrequencysignal(eithertheinputsignalortheothersinewave)tomodulatethefrequencyoftheinitialoscillatorcreatinganaddedfrequencyseparatefromtheoriginalone.TurninguptheFMknobcreatesahairyandmoretubularsound.

• FilteringKnob:AdjustsaseparatefilterappliedonlytotheMonophonicPitchShiftingeffect.BasicallyitworkslikeatonecontrolforMonophonicPitchShiftingeffects.

• DestinationPull-DownMenu:SelectswhetherthatVoiceisdirectedtoboththeDistortionandFiltermodules,onlytheFiltermodule,orbypassesbothmodulesandgoesdirectlytotheOutputMixer.

Processor 1 & 2 Distortion

AddsdistortiontoanyofthefourVoices.Distortionisaverycommonlyusedinanalogmodularsynthesizers-itnotonlyaddsintensitytothesound,itshighharmoniccontentheavilyaccentuatesthesoundofthemodulatingfilters.TheC4includes13typesofdistortion,anythingfromasubtledriveeffecttoextremelyfuzzyFoldbackeffects.

PleasenotethatitisonlypossibletorunanyorallofthefourVoicesthroughasingledistortiontypeandthattheDistortionmodulehasonlyonesetofmastercontrols.

• OnButton:EngagesordisengagestheDistortionmodule.• VoiceMixMonitors:ThefourmeterslabeledVoice1through4monitortheProcessor1&2

ratioofeachVoicethroughtheDistortionblock.• DistortionTypeDropdownMenu:ChoosefromanyoftheC4’s13differentdistortiontypes.


• DriveKnob:Adjuststheamountofdistortion.• CleanMixKnob:Adjuststhemixrationofcleantodistortedsignal.SettingtheCleanMixall

thewaytoleftoffersa100%cleanmix,allthewaytotherightisa100%distortedmix,and12o’clockontheknoboffersa50/50clean/distortedmix.

• OutputKnob:AdjuststheoverallleveloftheoutputsignalcomingfromtheDistortionblock.

Processor 1 & 2 Filters

TheFiltersplayacrucialroleindevelopingthecharacterofyourpreset.Basicallyafilterboostsorcutscertainsegmentsofasound’sfrequencyspectrum.Modulatingthesefilters(a.k.amovingthemupanddownoverthesignal)createsaneffectsimilartomanyofthesoundswehearinthephysicalworld(forexamplethesoundofaninstrumentbeingstruckorthatofahumanvoice).TheC4Synthhasover20differentFilterstochoosefrom.

PleasenotethatunliketheDistortionProcessor,bothoftheFilterProcessorsrunindependently,meaningthatitispossibletosimultaneouslyruntwofilterssimultaneously.TheFiltertypesandparametercontrolsforProcessors1and2willrunindependentlyofoneanother.

• OnButton:EngagesordisengagestheFiltermodule.• VoiceMixMonitors:ThefourmeterslabeledVoice1through4monitortheProcessor1&2

ratioofeachVoiceroutedtotheFilter.• FilterTypeDropdownMenu:ChoosefromanyoftheC4’s28differentfiltertypes.• InvertButton:Invertsthedirectionofthefiltermodulation.Forexampleifasinglelow-pass

filterissettomodulateitscut-offpointfromthelowerfrequenciestothehigherfrequencies,theInvertbuttonwillchangethedirectionofthefiltermodulationandmoveitfromthehigherfrequenciestothelowerfrequencies.

• DepthKnob:Adjuststhebreadthofthefiltermodulation.AstheDepthknobisincreased,sodoesthefrequencyrangeoverwhichthefiltermoves.

• FrequencyKnob:Adjuststhestartingpointofthefiltermodulation.Turningtheknobtotheleftcausesthefiltertomodulateoverlowerfrequenciesandturningtheknobtotherightcausesthefiltertomodulateoverhigherfrequencies.

• QKnob:Adjuststheintensity(alsoreferredtoas“resonance”)ofthefilter.IncreasingtheQknobessentiallybooststheheight(or“level”)ofthefrequencypeaksanddeepensthenotchesinthefrequencycuts.


• Envelope/LFOSelectorDropdownMenu:SelectswhetherEnvelope/LFO1orEnvelope/LFO2controlsthefiltermodulation.

• PitchTrackingDropDown:EngagingthePitchTrackinginitiatesafunctionwheretheFiltermodulationandPitchTrackingworkintandem,meaningthatthefilterwillmoveitsstartingpointinthefrequencyspectrumbasedonthenotethatisbeingplayed.Therearethreedifferentpitchtofilterfrequencyratios:1/3Octave,2/3Octave,and1Octave.Soforexample,ifyousetyourPitchTrackingto1/3OctaveandplayalowEthenanEuponeoctave,thefilter’sfrequencystartingpointwillmoveup1/3ofanoctavewiththehigherEfromwhereitwasforthelowerE.IfyousettheyourPitchTrackingto1Octave,thefrequencystartingpointwillmoveupafulloctavewhenmovingfromalowEtoEatthenextoctave.

Mix 1 & 2

• Mix1andMix2Blocks:ThefourmeterslabeledVoice1through4monitorthesignalratioroutedthroughProcessors1&2.PleasenotethatsettingtheDestinationofMix1toOutput1OnlyandMix2toOutput2Onlyisnecessaryincreatingstereoeffects.EachVoice’spositioninthestereospreadissetwiththeProcessorPancontrolineachoftheVoiceblocks.

• DestinationDropdownMenus:ChoosethefinalOutputDestinationofProcessors1and2.Itispossibleroutethesignalasfollows

o Output1Only:RoutesallofthatProcessor’ssignalstotheC4’sOutput1jack.


o Output1+Output2:RoutesallofthatProcessor’ssignalstoboththeOutput1&2jacks.

o Output2Only:RoutesallofthatProcessor’ssignalstotheC4’sOutput2jack.

Envelope 1 & 2

TheEnvelopescontrolamplitudeandfiltermodulationoftheeachC4Voice.BothEnvelopes1and2runindependentlyofeachotherandeachcanbeassignedadifferentsetofVoices.

• AudioInputSelectorDropdownMenu:SelectstheaudioInput(selectfromAudioInput1andAudioInput2)towhichtheEnvelopewillrespond.Thisabilitytoisolatewhichinputsignaleachenveloperespondstoallowsforwhatisknowas“sidechaining”theenvelope,meaningtheenvelopecanreacttoasignalthatisnotnecessarilybeingfedintooneoftheVoicesorbeingheardintheC4’sfinalOutputMix.

• EnvelopeTypeDropdownMenu:ChoosestheresponseoftheEnvelope.TheC4offersseveraldifferentenvelopetypeseachwithadifferentsetofAttack,Decay,Sustain,andReleasecharacteristics.

• SpeedKnob:DependingonwhichEnvelopeTypehasbeenselected;theSpeedcontroladjustshowquicklytheenvelopeopensand/orcloses.

• SensitivityKnob:Adjustshowsensitivetheenvelopeistotheleveloftheincomingsignal.TurningthedowntheSensitivityallowsforharderplaying,requiringthattheplayerpluckharderinordertofullyopentheenvelope.TurninguptheSensitivityincreasesthelikelihoodthattheenvelopeopensfullywithlighterplaying.

• GateKnob:AdjuststhesensitivityofaninternalGateontheEnvelope’scontroloveramplitude.ThismeansthatastheGateknobisincreasedtheamplitudeoftheoscillatorswillmovetozerowhentheystopreceivinganinputsignalabovetheassignedamplitude.TheGatealsoaffectstheEnvelopetoSpeedandEnvelopetoDepthcontrols(locatedintheLFO1&2block).


LFO 1 & 2

TheLFOs(LowFrequencyOscillators)canbesettocontroltheFiltermodulation,Sequencerrates,orTremolorates(amplitudemodulation).

• LFOWaveShapeSelectorDropdownMenu:Choosefrom14differentLFOwaveshapes.EachwaveshapeevokesadifferentcharacterfromtheFilterandTremolomodulation.ChoosefromarangeofsoundsfromasmoothSinewavemodulationtoachoppierSquarewavemodulation.

• RestartonEnv1TriggerButton:SelectingthisbuttonallowsyourestartanLFOpatterneverytimeanewnoteisstruck.ThiscanbeespeciallynoticeablewithslowmovingLFOratesoroddlyshapedLFOslikethe4SteporRisingSaw.ItisalsousefulwhenusinganLFOtocontrolaSequencerpatternbyallowingyoutorestarttheSequencerpatternwitheachstrikeofanote.

• LFOTimeRatioDropdownMenu:TheC4limitstheusertooneLFOwaveshapeatatime,butitispossibletoruntwoLFOsatdifferentBeatDivisions.Forexample,byselecting“LFO2=2xLFO1,”LFO1wouldrunataquarternotebeatdivisionwhileLFO2runsa16thnotebeatdivision.

• SpeedKnob:AdjuststherateoftheLFO.PleasenotethatifLFO1andLFO2aresettodifferentbeatdivisions,bothrateswillincreaseordecreasetoscaleduringSpeedknobadjustments.

• EnvelopeToSpeed:ReliesontheenvelopefiltertoincreaseanddecreasethespeedoftheLFO.TurningthisknobtotherightcausestheLFOtomodulatefasterastheenvelopeopensthenslowasthenotefadesandtheenvelopecloses.TurningthisknobtotherightincreasesthemaximumLFOmodulationrate.

• EnvelopetoDepthKnob:ReliesontheenvelopefiltertoincreaseanddecreasethedepthoftheLFO.TurningthisknobtotherightcausestheLFOtomodulatedeeperastheenvelopeopensthendecreaseasthenotefadesandtheenvelopecloses.TurningthisknobtotherightincreasesthemaximumLFOmodulationdepth.

• LFO2PhaseKnob:IncreasesthephaseoffsetofLFO2formLFO1.TurningtheknoballthewayupcreatesacompletephasereversalbetweenthetwoLFOs.


• TapTempoButton:TapthisbuttonintimewithadrummerorrhythmtracktooverridetheSpeedknob’ssettingandmanuallysettheLFOrate.PleasenotethatifLFO1andLFO2aresettodifferentbeatdivisions,bothrateswillincreaseordecreasetoscaleduringTapTempoadjustments.

• BeatDivisionDropdownMenu:SetsthebeatdivisionofLFO1.NotethatthebeatdivisionofLFO2isasub-setofLFO1anditissetintheLFOTimeRatioDropdownMenu.

• HzButton:ProvidesareadoutinHertzwithintheLFOSpeedMonitorWindow.Notethat1.00Hz=60BeatsPerMinute(BPM).

• BPMButton:ProvidesaBPM(BeatsPerMinute)readoutintheLFOSpeedMonitorWindow.• LFOSpeedMonitorWindow:MonitorstheLFOrate.Usethiswindowtotypeinspecific

HertzorBPMratesorusetheupanddownarrowstomakesubtleLFOrateadjustments.• MIDIClock:TheC4’sLFOalsorespondstoexternalMIDIclock,whichitcanreceiveviaeither

theUSBportorthefromaconnectedNeuroHub.

Sequencer 1 & 2

TheC4featurestwosimultaneouslyrunningSequencers.WiththeSequencersitispossibletocreatetwonotepatternsupto16stepslong.TheSequencerscomewith16differentpre-madesequencesallofwhichcanbeeditedintoyourowncustompattern.PleasenotethatSequencer1respondstoVoicesassignedtoaSourcelabeledwitha“1”(ex.Square1,Sine1,Saw1)andSequencer2respondstoVoicesassignedtoaSourcelabeledwitha“2”(ex.Square2,Sine2,Saw2).

• SequenceDropdownMenu:Selectfromanyofour16premadeSequencerpatterns.Useanyofourpatternsasajumpingoffpointtocreateyourowncustomsequence.

• StepSelectorDropdownMenu:Selectthenumberofstepsinyoursequence,anythingfrom1to16steps.

• SemitoneMonitor:Indicatesthenoteofthecurrentstepinsemitones.Asemitoneisequaltoahalfstepintraditionalmusicterms.Eachstepcanbeassignedtoanynoteupordowntwooctavesfromtherootnote.

• StepMonitorBars:The16barsineachoftheSequencersindicateeachindividualstepandnote.Toeditastep,grabitwithyourcursoranddragthenoteupordown–thesemitonevalueofthestepcurrentlybeingeditedwillshowupintheSemitoneMonitor.Youcanalsoclicktheupordownarrowkeysonyourkeyboardtoadjustthenoteoftheselectedstep.


Pitch Detector

TheC4’sPitchDetectorisanalgorithmthatdetectsthepitchoftheconnectedinstrumentandusesitasaguidetocreatePitchSynthesis,ShiftingorHarmonyeffects.Innearlyeverycasetheuserdoesn’tneedtoworryabouttheresponseofthePitchDetector–thatsaid,wedooffersomeadjustableparametersthatrefinethePitchDetectorandfurtherdecreaselatencyandimprovepitchaccuracy.NarrowingtherangeofnotesyouexpecttoplaythoughtheC4willhelpinprovidingthebestpossibleresponsefromtheC4.

• SourceDropdownMenu:SelectswhichInputsignalthePitchDetectoralgorithmresponds.• LowNoteDropdownMenu:Selectthelowestpossiblenoteyouplantoplay.Youmayselect

anoteaslowasalowBona5-stringbass.• HighNoteDropdownMenu:Selectthehighestpossiblenoteyouplantoplay.Youmay

selectanoteashighasthe24thfretEona6-stringguitar.• Mode:TheC4’sPitchDetectorhasachoiceoftwodifferentmodes.FasterTrackingisthe

defaultmodeanditisthebestoptionwhenfastplaying.HighAccuracyTrackingisthesecondmodeanditisbestforslowerplayingwherepitchaccuracyiscrucial.

Harmony

UsetheHarmonymoduletoassignkeyandscalefortheIntelligentHarmonizationfunction.Selectingthe“Harmonization”fromtheIntervalModeDropdownmenuengagesthisfunction.UnliketheNormalfixedpitchInterval,theHarmonizationpitchintervalsfluctuateaccordingtotheselectedkeyandscale.

• KeyDropdownMenu:SelectstheHarmonykey.


• ModeDropdownMenu:Setsthescaleormodeoftowhichtheharmonizationadheres.Scaleandmodesinclude:Ionian(Major),Dorian,Phrygian,Lydian,Mixolydian,Aeolian(NaturalMinor),Locrian,HarmonicMinor,LocrianNatural6,Ionian#5,Dorian#4,PhrygianNatural3,Lydian#2,Alteredbb7,JazzMinor,PhrygianNatural6,Lydian#5,Lydianb7,Mixolydianb6,LocrianNatural2,AlteredScale,Half-Whole,Whole-Half

• Intervals1&2DropdownMenus:SelectsthecoreharmonyintervalforeachVoice.Interval1setstheintervalforVoicesassignedtoaSourcelabeledwitha“1”(ex.Square1,Sine1,Saw1).Interval2setstheintervalforVoicesassignedtoasourcelabeledwitha“2”(ex.Square2,Sine2,Saw2).

• Tuning:BydefaultalloftheC4’sharmonizednotesadheretostandardA440tuning.Ifyou’reinstrumentistunedupordownlessthanasemitone,usetheTuning(440Hz)controllertomakefineadjustmentstotheharmonizednotes.

Knob Assign

UsetheControl1KnobAssignandControl2KnobAssigndropdownmenustoselectwhichparameterareassignedtoCONTROL1&CONTROL2knobsonthefaceofthepedal.

External Control

TheExternalControlblockiswhereexternalexpressioncontrolisassignedtodevicesliketheSourceAudioDualExpressionPedal,HotHand3WirelessController,andexpressiondevicesconnectedtoaNeuroHub.AllexternalcontrolexpressiondevicesconnecttotheCONTROLINPUTjackonthetopsideofthepedalwitha1/8”TRRScable.

• ONButton:Engages/disengagesexternalcontrol.• ControlSource:Itispossibletocontroluptothreeparameterswithexternalexpression–

eachofthethreerowsintheExternalControlblockareassignabletoasingleparameter.Use


theControlSourcedropdownmenustoselectthetypeofexternalcontrollerbeingused.Therearethreedifferentoptionsinthismenu:

o ControlInputX:SelectthisoptionwhenusinganexpressionpedalortheX-axisoftheHotHand3WirelessController.

o ControlInputY:SelectthisoptionwhenusingtheY-axisoftheHotHand3WirelessController.

o Expression(Hub/MIDI):SelectthisoptionwhenusinganexpressioncontrollerconnectedtotheEXPINorSENSORINjacksontheNeuroHub.

o OFF:Usethisoptiontodisengageexpressioncontrolfortheentirerow.• ControlOption:Selectfromalonglistofparametersavailableforexpressioncontrol.• Min(%)andMax(%):Setsthehighandlowpointsofeachparameterreceivingexpression

messages.SettingMin(%)to0andMax(%)to100willassignthefullbreadthoftheparametertotheexpressioncontroller.

Routing & Options

TheC4’sstereoinputsandoutputsofferdramaticstereoeffectsandcomplexsignalroutingoptions,including“sidechain”andtheinsertionofexternalpedalstothesignalpath.MostofthestereoOutputroutingcanbeaccomplishedwiththeeachVoice’sProcessorPanparametercombinedwiththefinalDestinationdropdownintheMIX1&2blocks.(SeetheProcessorPansectionfordetailsonstereorouting)

• InputRoutingOption:SelectstheconfigurationoftheInputjacksperpreset.Therearefourdifferentoptions:

o AutoDetect(Default):Thisisthedefaultsetting–itdetectswhichinputjacksarecurrentlybeingusedandconfigurestheroutingaccordingly.

o SingleInput1:UsethissettingifyouhaveasingleinstrumentcablepluggedintoInput1.

o DualInput1&2:UsethissettingifyouhaveinstrumentcablespluggedintobothInputs1&2.

o ExternalLoop(Pre-Processing):ItispossibletomanuallysetupmostallstereoInputandOutputroutingusingacombinationoftheProcessorPanparameterineachoftheVoiceblocksandtheDestinationdropdownmenuintheMixblocks–thisincludeseffectsloopseitherbetweenVoicesorattheendofthesignalpath.Theone


routingoptionthatcan’tbesetupmanuallyistheanexternaleffectsloopthatplacestheexternaleffectinfrontoftheC4’sVoiceprocessor.Choosethisoptionifyouwishtocreateapre-Voiceexternaleffectsloop.Seethediagrambelowtogetabetterunderstandingoftherouting.

• PresetRecallState:SelectstheEngaged/DisengagedstateofthepresetwhenrecalledviaaMIDIProgramChange(PC)message.

Presets ThePresetssection,locatedontherightsideoftheC4’sNeuroDesktopinterface,displaysthelocationofallpresetsstoreddirectlytothepedal.ThePresetssectionisalsowhereuserscanbrowse


thePublishedPresetsofotherC4Synthusers.TherearetwoviewsavailableinthePresetssection-clickontheiconlabeledDeviceorCloud(locatedinthebluesquareonthetoprightcorner)toopeneachviewrespectively.

Device ClickingtheDeviceicononthetop-rightcornerofthePresetssectionopenstheDeviceinterface.Thisviewdisplaysthepresetssavedtoall128possiblelocationsonyourC4pedal.Thisviewalsocontainsbuttonsthatsave,export,import,andpublishpresets:

• SAVEButton:Ifyouhavemadeeditstoapre-existingpreset,usetheSavebuttontoupdatethepresetwithoutchangingitsnameorpresetposition.

• SAVEASButton:AftercreatinganewpresethittheSaveAsbuttonandyouwillbepromptedtonameitandselectitspresetnumber.

• IMPORTButton:Uploadssaved.prefilestoyourNeuroDesktopEditor.UponclickingtheIMPORTbuttonyouwillbeaskedtofindthe.prefile.SimplygotoyourNeuropresetsfolder,selectthedesiredfileandupload.

• EXPORTButton:UsetheExportbuttontosaveapresetonyourcomputer.Presetsaresavedas.prefilesandstoredanywhereonyourcomputer(werecommendcreatingadedicatedfoldertostoreyourpresets).Aftercreatingapreset,hittheExportbutton-awindowwillpopup,askingyoutoname,tag,andselectalocationforthepreset.

• SAVETOCLOUDButton:ItisalsopossibletosaveyourpresettoaprivateCloudbasedstoragelocationorPublishitfortherestoftheC4Synthcommunitytotry.Aftercreatingapreset,hit


theSAVETOCLOUDbutton.Aboxwillpopupaskingyoutonameitandprovideadescription.ItwillalsoaskyouforYouTubeorSoundCloudlink(thisisoptional).TheYouTubeandSoundCloudlinksarethereforyoutoembedsoundclipsofyourpresetsothatotherscanquicklyhearwhatyou’vecreated.FromthereyoucaneitherSaveittoyourprivateCloudbasedstorage(availableintheMyLibrarytabintheCloudview)orSaveandPublishitfortherestoftheC4community.

• REFRESHButton:HittheRefreshbuttontorestoretheNeuroDesktopeditstothestateimmediatelyafteryourlastSAVEprocedure.

• C4SYNTHPRESETS:Thisfield,belowtheDevicebuttons,displaysallofthepresetssaveddirectlytoyourC4Synth.Theyarelabeled1through128.ThefirstsixpresetpositionsaredirectlyaccessibleviatheC4’sthreetoggleswitchpositionsandtwopresetbanks,therestareaccessibleviaanexternalMIDIhostcontrollerwithUSBconnectioncapabilities.

Cloud ClickingtheCloudicononthetop-rightcornerofthePresetssectionopenstheCloudinterface.ThisviewdisplaystheCommunity,Factory,MyLibrary,andMyPublishedpresetstabs.ClickeachrespectivetabtoopenitsuniquecollectionofCloudbaseduserpresets.TheCloudviewalsoincludesaSearch/Filtersectionjustbelowthetaboptions.


Browse, Burn, and Play TheCloudoffersaccesstothevastlandscapeofC4presetcreatedbytheSourceAudiostaffandtheever-growingcommunityofC4users.It’saseasyas“Browse,Burn,andPlay.”

ThegraphicabovedisplaystheCloudviewofC4SynthUserPresets.TotestaPreset,simplyclickanywhereonthePresetlisting,instantlythePresetwilluploadtoyourC4pedal.Ifyoulikewhatyouheargotothetop-rightcornerofthatPresetlistingandclickeithertheBURNorDOWNLOADicons.IfyouwanttosavethesounddirectlytooneofthetoggleswitchpositionsonyourC4pedal(oroneoftheC4’s128MIDIaccessiblepresets),simplyclicktheBURNicon(theflame)touploadthepresetdirectlytoyourpedal.AfterclickingtheBURNiconaboxwillpopupaskingwhereyouwouldliketostorethepreset–selectapositionandhitSAVE.ThePresetisnowloadedtoyourC4andreadyforthenextgig.


TosaveaPresettoyourpersonalLibraryofPresets,clicktheDownloadiconandhitSAVE.ThePresetwillstoreinstantlytotheMYLIBRARYtab.

• COMMUNITYTab:ClicktheCommunitytabtoviewallofthepresetscreatedbytheentireNeurocommunity.Totestapreset,simplyclickanywhereonthepresetlistinganditwillinstantlyuploadtoyourC4pedal.

• FACTORYTab:ContainspresetscreatedbytheSourceAudioteamandothersynthaficionados.• MYLIBRARYTab:Containsallthepresetsyouhavesavedtoyourpersonalpresetlibrary.• MYPUBLISHEDTab:Containsallthepresetsthatyouhavepublishedandmadeavailabletothe

entireC4Synthcommunity.

Daisy-Chaining Neuro Communication IfyouhavemultipleSourceAudioOneSeriespedalsrunninginseries,itispossibletomaintainNeurocommunicationwitheachpedalthroughasingleNeurocableconnection.SourceAudiomakescouplersthataredesignedspecificallyforconnectingmultipleOneSeriesproductsinseries.ThesecouplersareavailableattheSourceAudioReverb.comStore.


AstandardsetofTSandTRScablesworkaswell(werecommendtheflatTSandTRScablesmanufacturedbyRockboard).TheexamplesbelowexplainhowtomakeyourNeuroDaisy-Chainconnectionsinamonoorstereorig.

Mono Audio Path with Neuro Daisy-Chain Inthecaseofapurelymonoaudiosignalpath,theNeurodatacanbeinputtothefirsteffectdirectlyfromthemobiledeviceandthencarriedontothesecondeffectviaTRScable.

Mono-To-Stereo Audio Path with Neuro Daisy-Chain Inthecaseofasignalpaththatsplitsamonoinputtostereooutputs,theNeurodatacanbeinputtothefirsteffectdirectlyfromthemobiledeviceandthencarriedontoconsecutiveeffectsviaTRScables.Theaudiosignaliscarriedonthesamecable.


MIDI Through the USB Port or Neuro Hub TheC4respondstoMIDIProgramChange(PC)andContinuousController(CC)messagesviaitsminiUSBport.

TheC4Synth’sUSBportisplug-and-playreadyforDigitalAudioWorkstation(DAW)softwareonWindowsandMaccomputers.TheC4usesclass-compliantdrivers,sonospecialdriversareneeded.JustpowerupthepedalandconnectittothecomputerusingaUSBcable.ThecomputershouldautomaticallyrecognizetheC4,whichwillbeidentifiedas“SourceAudioOneSeries”intheoperatingsystem.

AMIDIhostdevicewithUSBwillalsocontroltheC4.TheC4respondstomostdevices,butsomedon’tgenerateenoughpowerfortheC4torecognizethemasaMIDIhost(theMIDIBabyandqCONNECTaretwoexamples).IfyourC4isnotrespondingtoyourMIDIhostdevice,trycheckingtheUSB-MIDISkipPowerCheckboxintheNeuroEditor’sHardwareOptionsmenu.

MIDI Channel Bydefault,theC4respondstoMIDIChannel1.TheC4ignoresallMIDImessagessenttoitthatarenotonitschannel.TheinputMIDIchannelfortheC4canbechangedintheHardwareOptionsmenuoftheNeuroEditors.NotethattheMIDIInputChannelisaglobalsettingthatisNOTsavedperpreset.NotethatsomemanufacturersbegincountingMIDIchannelsatzero(from0to15),whiletheSourceAudioNeuroEditorsusetheconventionofcountingfrom1to16.


The C4 Synth and the Neuro Hub CurrentlytheC4SynthcannotreceiveMIDIProgramChanges(PC)andchangepresetsviatheNeuroHub–PCmessagescanonlycomethroughtheC4’sUSBport.However,theC4canreceiveMIDICCmessagesthroughaNeuroHubconnection.

Custom MIDI CC Mapping TheC4SynthhasveryfewdefaultMIDImapping-MIDICCmessagesmustbemappedwiththeNeuroDesktopEditor.CustomMIDICCmappingsareglobal;theywillapplyinallsituations,regardlessofwhichpresetisactive.

TocreateacustomMIDICCmapping,followthesesteps:

1. ConnectyourC4totheNeuroDesktopEditor.2. InthetopbarmenuselectDevice>EditDeviceMIDIMapfromthedropdownmenu.3. TheC4SynthMIDIMapEditorwindowwillopen.ScrolltotheMIDICCvalueyouwishtomap

andselectthatCC’sdropdownmenu.Alistofparameterswillunfold.4. SelecttheparameteryouwishtoassigntothechosenCC.Theprocessiscomplete.

TheC4comeswithcertainfunctionsandparameterspre-mapped.ThefollowingtableliststhecurrentMIDImapping:

Parameter CC# Value Descript ion

External Tap Tempo 93 0-127 ExternallycontroltheLFOrateExternal Expression Control 100 0-127 AssignparameterswithNeuroEditorEngage/Bypass 102 0-127 0-64Bypass,65-127-EngagePreset Recal l (Off) 103 0-127 RecallsanypresetinbypassPreset Recal l (On) 104 0-127 RecallsanypresetengagedEngage/Bypass Toggle 105 any

ForparameterslikeMixandLevel,whicharenormallycontrolledbyknobs,thefullrangeofcontinuouscontrolvaluesfrom0to127willbemappedtotherangeoftheknob.

Fortheengage/bypassfootswitch,continuouscontrolvaluesintherangeof0-63willbypasstheC4andvaluesintherangeof64-127willenablethepedal.

AnyMIDICC,from0to127,canbemappedtoacontrolontheC4.

EachCCnumbercanonlybemappedtocontroloneparameteratanygiventime.IfyouattempttomapaCCthathasalreadybeenassignedtoanotherparameter,thepreviousmappingwillbeoverridden.

SeveralCCscanpotentiallybemappedtothesameparameter,althoughthisisnotveryuseful.


MIDI Clock TheC4Synth’sLFOwillsynctoMIDIclockmessages(alsoknownasMIDItimingclockorMIDIbeatclock).MIDIclockistempo-dependentandisusedtoensurethatmultipleMIDI-enableddevicesstayinsynchronization.AcommonuseofMIDIclockwiththeC4iswhenrecordingalongtoaclicktrackinaDAW(DigitalAudioWorkstation)runningonacomputer.MIDIclockcanbesenttotheC4directlyoverUSB-MIDIortheNeuroHub.

MIDIClockcanbeenabledwithintheC4onaper-presetbasis.ToenableMIDIClockgotheLFO1&2blockintheNeuroDesktopSoundEditorinterfaceandselecttheMIDIClockbutton.TheC4beginsitsMIDIClocksyncassoonasthefirstMIDIClockmessageisreceived.Ifthetempochanges,therateofMIDIClockmessageswillchangeaswell,andtheC4willadjusttoresynchronizeitselfaccordingly.

UsetheBeatDivisiondropdownmenuintheLFO1&2blockintheNeuroDesktopSoundEditortoselecttherhythmicsubdivisionoftheincomingMIDIClock.TheBeatDivisionoptionsareWhole,Half,Quarter,Eighth,Triplet,andSixteenthnotes.

TheC4doesnotsynctoMIDItimecodecontainingSMPTEtimestamps.

Updating C4 Synth Firmware FirmwareupdatesareachievedusingtheNeuroDesktopEditor.DownloadthelatestversionofNeuroDesktopEditorfromtheSourceAudioDownloadspage.OpentheupdatedNeuroDesktopandconnecttheC4SynthtoacomputerusingaminiUSBcable.IftheC4isinneedofanupdatetheFirmwareUpdatesicon(thearrowicon)intheConnectionsfieldwillbeframedinyellow.SimplyclickontheFirmwareUpdatesiconyouwillbepromptedthroughtheproces

C4 Synth Specifications Dimensions

• Length:11.63cm(4.58inches)• Width:7.00cm(2.75inches)• Height(notincludingknobsandfootswitch):3.71cm(1.46inches)


• Height(includingknobsandfootswitch):5.61cm(2.21inches)

Weight • 280grams(0.625pounds)

Power • 9VDC,minimum165mA(maximum195mAwhenconnectedtoapowerreliantexternal

controller)• Negativetip(positivesleeve)barrelpowerjack,2.1mminnerdiameter,5.5mmouterdiameter

Audio Performance • MaximumInputLevel:+6dBV=8.2dBu=2VRMS=5.6Vp-p• InputImpedance:1MegaOhm(1MΩ)• OutputImpedance:600Ohm(600Ω)• 108dBDNRAudioPath• 24-bitAudioConversion• 56-bitDigitalDataPath• UniversalBypassTM(relay-basedtruebypassandanalogbufferedbypass)

Troubleshooting General Restorefactorysettings:InordertoreverttheC4toitsfactorysettings,clearingalluserdata,presets,expressionmappingsandcustomeffecttypes,performafactoryresetusingoneofthemethodsdescribedbelow.

Factory Reset using the Hardware Disconnectpower.Whileholdingdownthefootswitch,reconnectpower.ThemainLEDandcontrolLEDwillbelitforafewseconds.WhentheresetiscompletebothLEDswillturnoffandyoucanreleasethefootswitch.

Factory Reset using the Neuro Mobile App UsingtheNeuroMobileApp,gotoHardwareSettingsandchoosetheFactoryResetoption.

Factory Reset using the Neuro Desktop Editor ConnecttheTrueSpringReverbtotheNeuroDesktopEditor.FromthetopbarmenuselectDevice>FactoryReset>whentheConfirmFactoryResetwindowpopsup,select“Yes.”

Noise Powersource:Ensurethatthefactorypowersupplyisbeingused,oranisolatedpowersupplyorpedalpowerportproviding9Vandaminimumof165mA.

Nearnoisesource:Movepedalawayfrompowersuppliesandotherequipment.

Otherequipment:Removeothereffectsfromsignalchain;seeifnoisepersists.


Badcables:Swapoutaudiocables.

USBgroundloop:WhenconnectedtoacomputerusingaUSBcable,noisecanappearintheaudiosignal.ThisusuallyresultsfromgroundloopnoiseduetotheTrueSpringandcomputerrunningonseparatepowersupplies.Inthecaseoflaptops,disconnectingthecomputer’spowersupplyandrunningitonabatterycanoftenmitigatethenoise.Externaldisplaymonitorsareoftentheprimarysourceofnoise,andpoweringdownmonitorscanalsoresolvenoiseissues.

Unit Appears Dead / No LEDs Lit Effectisbypassed:PressthefootswitchtoenabletheeffectandseeifthemainLEDturnson.

Wrongpowersupply:Usecorrectpowersupply.SeetheDC9V(Power)sectionformoredetails.

Corrodedpowercableplug:Checkpowerplugforcorrosiononsleeve.Swapoutpowersupplyifnecessary.

Frequently Asked Questions What kind of instruments can I connect to the C4’s inputs? TheC4’saudioinputsarehighimpedance(~1MΩ).Itcanaccepthighimpedancesignalsourceslikeguitars/basseswithpassivepickups,aswellaslowimpedancesourceslikeline-levelaudiocircuits,guitars/basseswithactivepickups,electronickeyboards,ormixeroutputs.Theinputcircuitcanhandlesignalsrangingupto5.6Volts,peak-to-peak.

Can I power the C4 directly over USB, without using the 9 Volt supply? No.USBprovides5Volts,buttheC4needs9Volts,sothepedalcannotbepowereddirectlyfromUSB.Makesurethatyouhavepluggedintheincluded9VDCpowersupplywhenconnectingtotheTrueSpring’sUSBport.

When connecting the C4 to a recording interface or mixer, should I used a Lo-Z (microphone) or Hi-Z (line / instrument) input? TheC4’soutputwillbelowimpedancewhentheeffectisactiveorinbufferedbypassmode,butitwillbehighimpedancewhenusingtruebypassmodeandaguitarwithpassivepickups.Therefore,itisrecommendedthatyouuseahighimpedance(Hi-Z)inputonyourrecordinginterfaceormixertoavoidsignalloss.

Can I use the C4 in my amp’s effects loop? Theaudioinputscanhandleupto8.2dBuor5.6Voltspeak-to-peak,whichallowsthemtoworkinmostampeffectsloops.Inordertoavoidclipping,besuretocheckyouramp’sdocumentationandverifythatthemaximumsendlevelislessthan5.6Voltspeak-to-peak.

How do I update the firmware? FirmwareupdatesareachievedusingtheNeuroDesktopEditor.DownloadthelatestversionofNeuroDesktopEditorfromtheSourceAudioDownloadspage.OpentheupdatedNeuroDesktopandconnecttheC4SynthtoacomputerusingaminiUSBcable.IftheC4isinneedofanupdatetheFirmwareUpdatesicon(thearrowicon)intheConnectionsfieldwillbeframedinyellow.SimplyclickontheFirmwareUpdatesiconyouwillbepromptedthroughtheprocess.


Mac Gatekeeper Macusersmayseethiswarningmessagewhentryingtoopentheupdatersoftware:“Appcan’tbeopenedbecauseitwasnotdownloadedfromtheMacAppStore.”Inordertoruntheupdater,pleaserefertothestepsinthisApplesupportarticle:https://support.apple.com/en-us/HT202491.

Rubber Feet TheC4Synthcomesstandardwithaflataluminumbottom,makingiteasytoapplyVelcroandmounttoapedalboard.Additionally,adhesiverubberfeetareincludedintheC4’sbox.Applyingtherubberfeettothebottomofthepedalcanhelppreventitfromslidingonflatsurfacessuchasahardwoodfloor.

Waste Disposal Notes

Ifpossible,disposeofthedeviceatanelectronicsrecyclingcenter.Donotdisposeofthedevicewiththehouseholdwaste.

ForfullcompliancewithEN61000-4-6standard,inputcablemustbelessthan3metersinlength.


Warranty Limited Transferrable Warranty SourceAudio,LLC(hereinafter“SourceAudio”)warrantsthatyournewSourceAudioOneSeriesC4Synth,whenpurchasedatanauthorizedSourceAudiodealerintheUnitedStatesofAmerica(“USA”),shallbefreefromdefectsinmaterialsandworkmanshipundernormaluseforaperiodoftwo(2)yearsfromthedateofpurchasebytheoriginalpurchaser.PleasecontactyourdealerforinformationonwarrantyandserviceoutsideoftheUSA.

UnderthisLimitedWarranty,SourceAudio’ssoleobligationandthepurchaser’ssoleremedyshallberepair,replacement,orupgrade,atSourceAudio’ssolediscretion,ofanyproductthat,ifproperlyusedandmaintained,provestobedefectiveuponinspectionbySourceAudio.SourceAudioreservestherighttoupdateanyunitreturnedforrepairandtochangeorimprovethedesignoftheproductatanytimewithoutnotice.SourceAudioreservestherighttousereconditionedpartsandassembliesaswarrantyreplacementsforauthorizedrepairs.Anyproductrepaired,replaced,orupgradedpursuanttothisLimitedWarrantywillbewarrantedfortheremainderoftheoriginalwarrantyperiod.

ThisLimitedWarrantyisextendedtotheoriginalretailpurchaser.ThisLimitedWarrantycanbetransferredtoanyonewhomaysubsequentlypurchasethisproductprovidedthatsuchtransferismadewithintheapplicablewarrantyperiodandSourceAudioisprovidedwithallofthefollowinginformation:(i)allwarrantyregistrationinformation(assetforthontheregistrationcard)forthenewowner,(ii)proofofthetransfer,withinthirty(30)daysofthetransfer,and(iii)aphotocopyoftheoriginalsalesreceipt.WarrantycoverageshallbedeterminedbySourceAudioinitssolediscretion.Thisisyoursolewarranty.SourceAudiodoesnotauthorizeandthirdparty,includinganydealerorsalesrepresentatives,toassumeanyliabilityonbehalfofSourceAudioortomakeanywarrantyonbehalfofSourceAudio.

Warranty Information SourceAudiomay,atitsoption,requireproofoftheoriginalpurchasedateintheformofadatedcopyoftheoriginalauthorizeddealer’sinvoiceorsalesreceipt.ServiceandrepairsofSourceAudioproductsaretobeperformedonlyattheSourceAudiofactoryoraSourceAudioauthorizedservicecenter.PriortoserviceorrepairunderthisLimitedWarranty,thepurchasermustrequestfromSourceAudioareturnauthorization,whichisavailableat:

SourceAudioLLC120CummingsPark,Woburn,MA01801(781)932-8080oratwww.sourceaudio.net

Unauthorizedservice,repair,ormodificationwillvoidthisLimitedWarranty.


Disclaimer and Limitation of Warranty Donotopentheeffectspedalunderanycircumstance.Thiswillvoidthewarranty.

TheforegoinglimitedwarrantyistheonlywarrantygivenbySourceAudioandisinlieuofallotherwarranties.Allimpliedwarranties,includingwarrantiesofmerchantabilityandfitnessforanyparticularpurpose,exceedingthespecificprovisionsofthislimitedwarranty,areherebydisclaimedandexcludedfromthislimitedwarranty.Uponexpirationoftheapplicableexpresswarrantyperiod,SourceAudioshallhavenofurtherwarrantyobligationofanykind,expressorimplied.SourceAudioshallinnoeventbeliableforanyspecial,incidental,orconsequentialdamagessufferedbythepurchaseroranythirdparty,includingwithoutlimitation,damagesforlossofprofitsorbusinessordamagesresultingfromuseorperformanceoftheproduct,whetherincontractorintort.SourceAudioshallnotbeliableforanyexpenses,claims,orsuitsarisingoutoforrelatingtoanyoftheforegoing.Somestatesdonotallowtheexclusionorlimitationofimpliedwarrantiessosomeoftheabovelimitationsandexclusionsmaynotapplytoyou.ThisLimitedWarrantygivesyouspecificlegalrights,andyoumayalsohaveotherrights,whichvary,fromstatetostate.ThisLimitedWarrantyonlyappliestoproductssoldandusedintheUSA.SourceAudioshallnotbeliablefordamagesorlossresultingfromthenegligentorintentionalactsoftheshipperoritscontractedaffiliates.Youshouldcontacttheshipperforproperclaimsproceduresintheeventofdamageorlossresultingfromshipment.

Version History July16,2019:InitialRelease

©SourceAudioLLC|120CummingsPark,Woburn,MA01801|www.sourceaudio.net

SA248 C4 Synth User Guide - Source Audio Website · 2019-08-30 · SA249 C4 Synth User Guide 5...

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