Intellijel Quadra Manual 

Quadra​ ​&​ ​Expander Quad​ ​Function​ ​/​ ​Envelope​ ​Generator

Table​ ​of​ ​Contents Table​ ​of​ ​Contents Overview Quadra​ ​Features Additional​ ​Expander​ ​Features Installation Before​ ​Your​ ​Start Installing​ ​Your​ ​Module Quadra​ ​Front​ ​Panel Controls Inputs​ ​and​ ​Outputs Expander​ ​Front​ ​Panel Controls Inputs​ ​and​ ​Outputs Functions​ ​and​ ​Envelopes Linear​ ​Versus​ ​Exponential​ ​Shapes Quadrature​ ​Mode ADSR​ ​Envelope​ ​Generation​ ​Using​ ​the​ ​OR​ ​Outs Patch​ ​Examples Technical​ ​Specifications Page​ ​1

Overview The​ ​Intellijel​ ​Quadra​ ​and​ ​Expander​ ​modules​ ​comprise​ ​four​ ​parallel​ ​function​ ​generators​ ​(more commonly​ ​referred​ ​to​ ​as​ ​ ​“Envelope​ ​Generators”.​ ​The​ ​Quadra​ ​function​ ​generators​ ​have​ ​three modes,​ ​AD​ ​(Attack,​ ​Decay),​ ​ASR​ ​(Attack,​ ​Sustain,​ ​Release)​ ​and​ ​Cycle​ ​(perpetually​ ​repeating AR​ ​envelope​ ​or​ ​unipolar​ ​LFO).​ ​Each function​ ​can​ ​be​ ​configured​ ​to​ ​have​ ​a linear​ ​or​ ​exponential curve​ ​and​ ​they​ ​feature​ ​a​ ​wide​ ​time​ ​base​ ​control​ ​from​ ​0.5ms​ ​to​ ​over​ ​30​ ​seconds.​ ​The​ ​Expander enhances​ ​the​ ​core​ ​functionality​ ​by​ ​allowing​ ​attenuated​ ​voltage​ ​control​ ​over​ ​Attack​ ​and​ ​Decay for​ ​each​ ​function​ ​generator,​ ​a​ ​Quadrature​ ​mode,​ ​and​ ​an​ ​analog​ ​OR​ ​mixer​ ​for​ ​each​ ​function generator​ ​pair. This​ ​manual​ ​will​ ​cover​ ​both​ ​the​ ​Quadra​ ​and​ ​its​ ​optional​ ​Expander​ ​module. Quadra​ ​Features ● Four​ ​function​ ​generators​ ​with​ ​Attack​ ​and​ ​Decay​ ​times​ ​ranging​ ​from​ ​from​ ​0.5​ ​milliseconds to​ ​over​ ​30​ ​seconds. ● Three​ ​modes:​ ​AD​ ​(attack,​ ​decay),​ ​ASR​ ​(attack,​ ​sustain,​ ​release),​ ​Cycle​ ​(AD​ ​envelope loops) ● Exponential​ ​and​ ​Linear​ ​envelope​ ​curves Additional​ ​Expander​ ​Features ● Four​ ​End​ ​of​ ​Cycle​ ​pulse​ ​outputs​ ​corresponding​ ​to​ ​the​ ​four​ ​function​ ​generators. ● Voltage​ ​control​ ​of​ ​attack​ ​and​ ​decay​ ​(with​ ​attenuators)​ ​of​ ​all​ ​four​ ​envelopes ● Two​ ​analog​ ​OR​ ​(Also​ ​known​ ​as​ ​Peak​ ​Circuit)​ ​logic​ ​outputs​ ​that​ ​are​ ​normalled​ ​to​ ​the​ ​two pairs​ ​of​ ​envelopes​ ​with​ ​attenuators. ● Special​ ​Quadrature​ ​modes. Page​ ​2

Installation Intellijel​ ​Eurorack​ ​modules​ ​are​ ​designed​ ​to​ ​be​ ​used​ ​with​ ​a​ ​Eurorack-compatible​ ​case​ ​and​ ​power supply. Before​ ​Your​ ​Start Before​ ​installing​ ​a​ ​new​ ​module​ ​in​ ​your​ ​case​ ​you​ ​must​ ​ensure​ ​your​ ​case’s​ ​power​ ​supply​ ​has sufficient​ ​available​ ​capacity​ ​to​ ​power​ ​the​ ​module: ● Sum​ ​up​ ​the​ ​specified​ ​+12V​ ​current​ ​draw​ ​for​ ​all​ ​modules,​ ​including​ ​the​ ​new​ ​one.​ ​Do​ ​the same​ ​for​ ​the​ ​-12​ ​V​ ​and​ ​+5V​ ​current​ ​draw.​ ​The​ ​current​ ​draw​ ​will​ ​be​ ​specified​ ​in​ ​the manufacturer's​ ​technical​ ​specifications​ ​for​ ​each​ ​module. ● Compare​ ​each​ ​of​ ​the​ ​sums​ ​to​ ​specifications​ ​for​ ​your​ ​case’s​ ​power​ ​supply. ● Only​ ​proceed​ ​with​ ​installation​ ​if​ ​none​ ​of​ ​the​ ​values​ ​exceeds​ ​the​ ​power​ ​supply’s specifications.​ ​Otherwise​ ​you​ ​must​ ​remove​ ​modules​ ​to​ ​free​ ​up​ ​capacity​ ​or​ ​upgrade​ ​your power​ ​supply. You​ ​will​ ​also​ ​need​ ​to​ ​ensure​ ​you​ ​have​ ​enough​ ​free​ ​space​ ​(hp)​ ​ ​as​ ​well​ ​as​ ​free​ ​power​ ​headers​ ​in your​ ​case​ ​to​ ​fit​ ​the​ ​new​ ​module. You​ ​can​ ​use​ ​a​ ​tool​ ​like​ ​ModularGrid​ ​to​ ​assist​ ​in​ ​your​ ​planning.​ ​Failure​ ​to​ ​adequately​ ​power​ ​your modules​ ​may​ ​result​ ​in​ ​damage​ ​to​ ​your​ ​modules​ ​or​ ​power​ ​supply.​ ​If​ ​you​ ​are​ ​unsure,​ ​please contact​ ​us​ ​before​ ​proceeding. Installing​ ​Your​ ​Module When​ ​installing​ ​or​ ​removing​ ​a​ ​module​ ​from​ ​your​ ​case​ ​always​ ​turn​ ​off​ ​the​ ​power​ ​to​ ​the​ ​case​ ​and disconnect​ ​the​ ​power​ ​cable.​ ​Failure​ ​to​ ​do​ ​so​ ​may​ ​result​ ​in​ ​serious​ ​injury​ ​or​ ​equipment​ ​damage. Ensure​ ​the​ ​10-pin​ ​connector​ ​on​ ​the​ ​power​ ​cable​ ​is​ ​connected​ ​correctly​ ​to​ ​the​ ​module​ ​before proceeding.​ ​The​ ​red​ ​stripe​ ​on​ ​the​ ​cable​ ​must​ ​line​ ​up​ ​with​ ​the​ ​-12V​ ​pins​ ​on​ ​the​ ​module’s​ ​power connector.​ ​The​ ​pins​ ​are​ ​indicated​ ​with​ ​the​ ​label​ ​-12V,​ ​a​ ​white​ ​stripe​ ​next​ ​to​ ​the​ ​connector,​ ​the words​ ​“red​ ​stripe”,​ ​or​ ​some​ ​combination​ ​of​ ​those​ ​indicators. Page​ ​3

Most​ ​modules​ ​will​ ​come​ ​with​ ​the​ ​cable​ ​already​ ​connected​ ​but​ ​it​ ​is​ ​good​ ​to​ ​double​ ​check​ ​the orientation.​ ​Be​ ​aware​ ​that​ ​some​ ​modules​ ​may​ ​have​ ​headers​ ​that​ ​serve​ ​other​ ​purposes​ ​so ensure​ ​the​ ​cable​ ​is​ ​connected​ ​to​ ​the​ ​right​ ​one. The​ ​other​ ​end​ ​of​ ​the​ ​cable,​ ​with​ ​a​ ​16-pin​ ​connector,​ ​connects​ ​to​ ​the​ ​power​ ​bus​ ​board​ ​of​ ​your Eurorack​ ​case.​ ​Ensure​ ​the​ ​red​ ​stripe​ ​on​ ​the​ ​cable​ ​lines​ ​up​ ​with​ ​the​ ​-12V​ ​pins​ ​on​ ​the​ ​bus​ ​board. On​ ​Intellijel​ ​power​ ​supplies​ ​the​ ​pins​ ​are​ ​labelled​ ​with​ ​the​ ​label​ ​“-12V”​ ​and​ ​a​ ​thick​ ​white​ ​stripe: If​ ​you​ ​are​ ​using​ ​another​ ​manufacturer’s​ ​power​ ​supply,​ ​check​ ​their​ ​documentation​ ​for instructions. Page​ ​4

Once​ ​connected,​ ​the​ ​cabling​ ​between​ ​the​ ​module​ ​and​ ​power​ ​supply​ ​should​ ​resemble​ ​the picture​ ​below: Before​ ​reconnecting​ ​power​ ​and​ ​turning​ ​on​ ​your​ ​modular​ ​system,​ ​double​ ​check​ ​that​ ​the​ ​ribbon cable​ ​is​ ​fully​ ​seated​ ​on​ ​both​ ​ends​ ​and​ ​that​ ​all​ ​the​ ​pins​ ​are​ ​correctly​ ​aligned.​ ​If​ ​the​ ​pins​ ​are misaligned​ ​in​ ​any​ ​direction​ ​or​ ​the​ ​ribbon​ ​is​ ​backwards​ ​you​ ​can​ ​cause​ ​damage​ ​to​ ​your​ ​module, power​ ​supply,​ ​or​ ​other​ ​modules. After​ ​you​ ​have​ ​confirmed​ ​all​ ​the​ ​connections,​ ​you​ ​can​ ​reconnect​ ​the​ ​power​ ​cable​ ​and​ ​turn​ ​on your​ ​modular​ ​system.​ ​You​ ​should​ ​immediately​ ​check​ ​that​ ​all​ ​your​ ​modules​ ​have​ ​powered​ ​on and​ ​are​ ​functioning​ ​correctly.​ ​If​ ​you​ ​notice​ ​any​ ​anomalies,​ ​turn​ ​your​ ​system​ ​off​ ​right​ ​away​ ​and check​ ​your​ ​cabling​ ​again​ ​for​ ​mistakes. Page​ ​5

Controls 1. ATTACK​ ​-​ ​These​ ​knobs​ ​control​ ​the​ ​time​ ​of​ ​the​ ​attack​ ​portion​ ​of​ ​the​ ​function​ ​(rising​ ​from zero​ ​to the​ ​maximum​ ​level).​ ​Slower​ ​times​ ​will​ ​create​ ​a​ ​fade​ ​in​ ​effect​ ​while​ ​faster​ ​times are​ ​used​ ​for​ ​snappy​ ​percussive​ ​sounds. 2. DECAY​ ​-​ ​These​ ​knobs​ ​control​ ​the​ ​fall​ ​to​ ​zero​ ​time.​ ​In​ ​ASR​ ​mode​ ​this​ ​will​ ​act​ ​as​ ​the release​ ​time.​ ​In​ ​Cycle​ ​mode​ ​the​ ​total​ ​time​ ​of​ ​attack​ ​and​ ​decay​ ​set​ ​the​ ​frequency​ ​of​ ​the LFO. 3. Exponential/Linear​ ​Switch​ ​-​ ​This​ ​will​ ​change​ ​the​ ​ ​shape​ ​of​ ​the​ ​attack​ ​and​ ​decay sections.​ ​This​ ​setting​ ​will​ ​alter​ ​the​ ​time​ ​base​ ​of​ ​the​ ​function​ ​generator.​ ​Depending​ ​on what​ ​you​ ​are​ ​patching​ ​the​ ​Quadra​ ​into,​ ​this​ ​setting​ ​may​ ​need​ ​to​ ​be​ ​changed.​ ​For example​ ​if​ ​patching​ ​into​ ​an​ ​exponential​ ​VCA​ ​you​ ​should​ ​use​ ​linear​ ​mode.​ ​The​ ​fastest envelope​ ​times​ ​are​ ​achieved​ ​when​ ​in​ ​linear​ ​mode. 4. Mode​ ​Switch​ ​-​ ​Selects​ ​AD,​ ​ASR​ ​or​ ​Cycle​ ​mode.​ ​AD​ ​is​ ​an​ ​envelope​ ​that​ ​ignores​ ​the incoming​ ​gate​ ​time​ ​and​ ​is​ ​simply​ ​triggered.​ ​This​ ​is​ ​often​ ​used​ ​with​ ​sequencers.​ ​ASR​ ​is similar​ ​to​ ​an​ ​ADSR​ ​in​ ​that​ ​it​ ​continues​ ​to​ ​sustain​ ​while​ ​the​ ​input​ ​gate​ ​is​ ​high.​ ​Cycle​ ​mode is​ ​like​ ​an​ ​LFO. 5. LED​ ​-​ ​ ​Shows​ ​the​ ​state​ ​of​ ​the​ ​function​ ​generator​ ​amplitude. Inputs​ ​and​ ​Outputs 6. TRIG​ ​Inputs​ ​-​ ​Patch​ ​trigger​ ​or​ ​gate​ ​signals​ ​here​ ​to​ ​launch​ ​the​ ​function​ ​generators. 7. ENV​ ​Outputs​ ​–​ ​The​ ​function​ ​generator​ ​is​ ​output​ ​here​ ​as​ ​a​ ​unipolar​ ​0-8v​ ​control​ ​signal. Page​ ​7

Controls A. End​ ​of​ ​Cycle​ ​LED​ ​-​ ​Indicates​ ​the​ ​completion​ ​of​ ​an​ ​envelope’s​ ​decay​ ​phase, corresponding​ ​with​ ​a​ ​gate​ ​signal​ ​sent​ ​out​ ​of​ ​the​ ​EOC​ ​output. B. Attack​ ​CV​ ​Input​ ​Attenuator​ ​-​ ​Controls​ ​the​ ​range​ ​of​ ​CV​ ​modulation​ ​applied​ ​to​ ​the function’s​ ​attack​ ​phase.​ ​The​ ​range​ ​increases​ ​as​ ​the​ ​knob​ ​turns​ ​clockwise.​ ​Generally best​ ​results​ ​are​ ​achieved​ ​by​ ​starting​ ​at​ ​zero​ ​and​ ​then​ ​increasing​ ​the​ ​amount​ ​until​ ​the desired​ ​level​ ​of​ ​modulation​ ​is​ ​discovered. C. Decay​ ​CV​ ​Input​ ​Attenuator​ ​-​ ​Controls​ ​the​ ​range​ ​of​ ​CV​ ​modulation​ ​applied​ ​to​ ​the function’s​ ​decay​ ​phase. D. Quad​ ​1+2​ ​Mode​ ​Switch​ ​-​ ​Engages​ ​Quadrature​ ​Mode​ ​for​ ​1+2​.​ ​When​ ​on​ ​(switched​ ​to​ ​the right),​ ​function​ ​1​’s​ ​end​ ​of​ ​attack​ ​will​ ​trigger​ ​function​ ​generator​ ​2​. E. Quad​ ​3+4​ ​Mode​ ​Switch​ ​-​ ​Engages​ ​Quadrature​ ​Mode​ ​for​ ​3+4​.​ ​When​ ​on,​ ​function​ ​3​’s end​ ​of​ ​attack​ ​will​ ​trigger​ ​function​ ​generator​ ​4​. F. OR​ ​1+2​ ​LED​ ​-​ ​Shows​ ​the​ ​state​ ​of​ ​the​ ​function​ ​generator​ ​amplitude​ ​for​ ​OR​ ​1+2 G. ENV​ ​2​ ​Or​ ​Amount​ ​Attenuator​ ​-​ ​Sets​ ​the​ ​level​ ​of​ ​ENV​ ​2​ ​into​ ​OR​ ​1+2​. H. ENV​ ​3​ ​Or​ ​Amount​ ​Attenuator​ ​-​ ​Sets​ ​the​ ​level​ ​of​ ​ENV3​ ​into​ ​OR​ ​3+4​. I. OR​ ​3+4​ ​LED​ ​-​ ​Shows​ ​the​ ​state​ ​of​ ​the​ ​function​ ​generator​ ​amplitude​ ​for​ ​OR​ ​3+4 Inputs​ ​and​ ​Outputs J. EOC​ ​–​ ​Outputs​ ​a​ ​high​ ​gate​ ​signal​ ​when​ ​the​ ​function​ ​generator​ ​has​ ​completed​ ​its​ ​Decay phase.​ ​The​ ​above​ ​yellow​ ​LED​ ​(A)​ ​indicates​ ​when​ ​the​ ​respective​ ​function​ ​generator​ ​has reached​ ​the​ ​end​ ​of​ ​its​ ​cycle. K. Attack CV​ ​Input​ ​-​ ​Allows​ ​an​ ​input​ ​signal​ ​to​ ​modulate​ ​attack​ ​time.​ ​This​ ​input​ ​is​ ​normalled to​ ​Decay​ ​CV​ ​Input​ ​(​D​),​ ​allowing​ ​both​ ​to​ ​be​ ​controlled​ ​together​ ​or​ ​separately​ ​via​ ​CV. L. Decay​ ​CV​ ​Input​ ​-​ ​Allows​ ​an​ ​input​ ​signal​ ​to​ ​modulate​ ​decay​ ​time. M. OR​ ​1+2​ ​Output​ ​-​ ​This​ ​is​ ​the​ ​mixed​ ​OR​ ​signal​ ​of​ ​1+2​.​ ​When​ ​using​ ​QUAD​​ ​1+2​ ​mode​ ​use this​ ​output​ ​for​ ​complex​ ​function​ ​shapes. N. OR​ ​3+4​ ​Output​ ​-​ ​This​ ​is​ ​the​ ​OR​ ​mixed​ ​signal​ ​of​ ​3+4​.​ ​When​ ​using​ ​QUAD​​ ​3+4​ ​mode​ ​use this​ ​output​ ​for​ ​complex​ ​function​ ​shapes. Page​ ​9

Functions​ ​and​ ​Envelopes While​ ​envelope​ ​generators​ ​may​ ​not​ ​seem​ ​as​ ​exciting​ ​as​ ​other​ ​modules​ ​like​ ​filters,​ ​oscillators, and​ ​effects,​ ​they​ ​play​ ​a​ ​critical​ ​role​ ​in​ ​creating​ ​movement​ ​and​ ​life​ ​in​ ​a​ ​patch.​ ​If​ ​you​ ​come​ ​from​ ​a more​ ​traditional​ ​synthesizer​ ​background,​ ​all​ ​this​ ​talk​ ​of​ ​function​ ​generators​ ​and​ ​Quadrature mode​ ​may​ ​seem​ ​overwhelming.​ ​Perhaps​ ​you​ ​find​ ​it​ ​strange​ ​that​ ​we​ ​talk​ ​about​ ​the​ ​Quadra​ ​as​ ​an envelope​ ​generator​ ​but​ ​then​ ​do​ ​not​ ​mention​ ​the​ ​most​ ​common​ ​envelope​ ​type,​ ​the​ ​ADSR.​ ​This is​ ​because​ ​the​ ​design​ ​concept​ ​of​ ​the​ ​Quadra​ ​is​ ​inspired​ ​by​ ​what​ ​is​ ​commonly​ ​referred​ ​to​ ​as “West​ ​Coast”​ ​synthesis​ ​concepts​ ​(a​ ​nod​ ​to​ ​Don​ ​Buchla,​ ​a​ ​pioneer​ ​in​ ​synth​ ​design​ ​from California).​ ​You​ ​can​ ​think​ ​of​ ​each​ ​function​ ​generator​ ​in​ ​the​ ​Quadra​ ​as​ ​a​ ​simple​ ​envelope generator.​ ​However,​ ​since​ ​the​ ​Quadra​ ​can​ ​also​ ​create​ ​very​ ​complex​ ​looping​ ​LFO​ ​shapes​ ​in Quadrature​ ​mode​,​ ​or​ ​create​ ​complex​ ​interacting​ ​combinations​ ​using​ ​the​​ ​OR​ ​outputs,​ ​we​ ​use​ ​the more​ ​traditional​ ​name​ ​of​ ​“Function​ ​Generator”. You​ ​can​ ​use​ ​the​ ​Quadra​ ​on​ ​its​ ​own​ ​as​ ​four​ ​AD​ ​or​ ​ASR​ ​envelope​ ​generators.​ ​If​ ​you​ ​are​ ​not using​ ​a​ ​traditional​ ​keyboard​ ​controller​ ​AD​ ​mode​ ​is​ ​preferred​ ​by​ ​many​ ​since​ ​it​ ​is​ ​independent​ ​of the​ ​incoming​ ​gate​ ​times.​ ​Once​ ​the​ ​AD​ ​is​ ​triggered,​ ​it​ ​will​ ​move​ ​through​ ​its​ ​stages​ ​until completion.​ ​This​ ​is​ ​ideal​ ​for​ ​sequencer​ ​or​ ​random​ ​based​ ​patches.​ ​You​ ​can​ ​use​ ​the​ ​Expander CV​ ​inputs​ ​to​ ​control​ ​the​ ​decay​ ​time​ ​which​ ​is​ ​like​ ​controlling​ ​the​ ​gate​ ​time​ ​at​ ​the​ ​sequencer,​ ​but has​ ​a​ ​different​ ​sound. Page​ ​10

Why​ ​would​ ​you​ ​use​ ​so​ ​many​ ​envelopes?​ ​If​ ​you​ ​consider​ ​the​ ​average​ ​synthesizer​ ​voice​ ​needs​ ​at least​ ​two​ ​envelopes,​ ​one​ ​for​ ​final​ ​VCA,​ ​the​ ​other​ ​for​ ​filter​ ​cutoff,​ ​it​ ​is​ ​not​ ​hard​ ​to​ ​imagine​ ​in​ ​a more​ ​complex​ ​voice​ ​how​ ​to​ ​use​ ​more.​ ​For​ ​example,​ ​another​ ​AD​ ​envelope​ ​could​ ​be​ ​used​ ​to control​ ​the​ ​modulation​ ​index​ ​of​ ​a​ ​two​ ​VCO​ ​FM​ ​patch.​ ​You​ ​can​ ​use​ ​envelopes​ ​to​ ​control​ ​the amount​ ​an​ ​LFO​ ​controls​ ​the​ ​filter​ ​via​ ​another​ ​VCA,​ ​or​ ​use​ ​a​ ​multed​ ​VCA​ ​in​ ​parallel​ ​with​ ​the​ ​final VCA​ ​to​ ​act​ ​as​ ​an​ ​effect​ ​send.​ ​You​ ​can​ ​see​ ​how​ ​with​ ​a​ ​little​ ​imagination​ ​and​ ​a​ ​lot​ ​of​ ​VCAs​ ​you will​ ​quickly​ ​run​ ​out​ ​of​ ​envelope​ ​generators,​ ​especially​ ​once​ ​you​ ​start​ ​designing​ ​percussive sounds. Linear​ ​Versus​ ​Exponential​ ​Shapes Linear​ ​Mode​ ​(switch​ ​to​ ​the​ ​right)​ ​-​ ​The​ ​Quadra​ ​makes​ ​straight​ ​lines​ ​as​ ​shown​ ​below​ ​on​ ​the​ ​left. This​ ​is​ ​best​ ​used​ ​with​ ​exponential​ ​VCAs.​ ​The​ ​fastest​ ​envelope​ ​times​ ​are​ ​achieved​ ​when​ ​in linear​ ​mode. Exponential​ ​Mode​ ​(switch​ ​to​ ​the​ ​left)​ ​-​ ​The​ ​Quadra​ ​creates​ ​a​ ​musical​ ​curved​ ​shape​ ​found​ ​on many​ ​classic​ ​envelope​ ​generators.​ ​This​ ​is​ ​best​ ​used​ ​with​ ​linear​ ​VCAs.​ ​The​ ​results​ ​in​ ​this​ ​mode tend​ ​to​ ​have​ ​a​ ​more​ ​plucked​ ​character. Page​ ​11

Quadrature​ ​Mode Quadrature​ ​Mode​ ​links​ ​the​ ​function​ ​generators​ ​into​ ​two​ ​pairs​ ​of​ ​looping​ ​envelopes​ ​that​ ​have interdependent​ ​timing.​ ​It​ ​vaguely​ ​resembles​ ​two​ ​waveforms​ ​that​ ​are​ ​phase​ ​shifted​ ​90​ ​degrees relative​ ​to​ ​each​ ​other​ ​(hence​ ​the​ ​“quadrature”​ ​label).​ ​Each​ ​pair​ ​is​ ​independent​ ​and​ ​functions identically,​ ​so​ ​we​ ​will​ ​concentrate​ ​on​ ​the​ ​function​ ​generator​ ​pair​ ​1+2​ ​for​ ​this​ ​section. In​ ​this​ ​mode,​ ​1​ ​is​ ​triggered​ ​and​ ​retriggered​ ​by​ ​its​ ​own​ ​end​ ​of​ ​cycle.​ ​1​ ​will​ ​not​ ​enter​ ​its​ ​decay phase​ ​until​ ​both​ ​1​ ​and​ ​2​ ​have​ ​completed​ ​their​ ​attack​ ​phase.​ ​2​ ​can​ ​either​ ​be​ ​triggered​ ​by​ ​the​ ​end of​ ​attack​ ​of​ ​1​,​ ​or​ ​by​ ​a​ ​gate​ ​or​ ​pulse​ ​sent​ ​to​ ​the​ ​TRIG​ ​2​ ​input.​ ​2​ ​will​ ​not​ ​enter​ ​its​ ​decay​ ​phase until​ ​it​ ​has​ ​completed​ ​its​ ​attack,​ ​and​ ​1​ ​completes​ ​its​ ​decay.​ ​This​ ​means​ ​that​ ​sometimes​ ​2​ ​will retrigger​ ​before​ ​completing​ ​its​ ​decay​ ​phase​ ​because​ ​1​ ​may​ ​complete​ ​its​ ​attack​ ​first.​ ​If​ ​2​ ​is​ ​set​ ​to cycle​ ​with​ ​short​ ​enough​ ​attack​ ​and​ ​decay​ ​values,​ ​it​ ​will​ ​cycle​ ​during​ ​1​’s​ ​attack. It​ ​may​ ​take​ ​some​ ​trial​ ​and​ ​error​ ​to​ ​gain​ ​a​ ​full​ ​understanding​ ​of​ ​how​ ​this​ ​mode​ ​works,​ ​and​ ​how best​ ​to​ ​take​ ​advantage​ ​of​ ​its​ ​behaviour.​ ​Quadrature​ ​mode​ ​is​ ​great​ ​for​ ​creating​ ​out​ ​of​ ​phase modulation​ ​of​ ​two​ ​related​ ​parameters.​ ​For​ ​example,​ ​modulating​ ​the​ ​waveforms​ ​or​ ​pulse​ ​width​ ​of two​ ​oscillators. Page​ ​12

ADSR​ ​Envelope​ ​Generation​ ​Using​ ​the​ ​OR​ ​Outs By​ ​using​ ​the​ ​OR​ ​output​ ​of​ ​the​ ​Expander​ ​and​ ​triggering​ ​two​ ​paired​ ​function​ ​generators​ ​with​ ​the same​ ​trigger​ ​or​ ​gate​ ​signal,​ ​an​ ​ADSR​ ​envelope​ ​can​ ​be​ ​achieved.​ ​For​ ​example,​ ​with​ ​1​ ​and​ ​2 triggered​ ​together,​ ​if​ ​1​ ​is​ ​set​ ​to​ ​AD​ ​and​ ​2​ ​is​ ​set​ ​to​ ​ASR,​ ​the​ ​OR​ ​1+2​ ​output​ ​will​ ​send​ ​an​ ​ADSR envelope.​ ​The​ ​Envelope​ ​2​ ​Amount​ ​Attenuator​ ​can​ ​be​ ​used​ ​to​ ​set​ ​the​ ​sustain​ ​level. Page​ ​13

Patch​ ​Examples Patch​ ​1:​ ​Basic​ ​Voice​ ​With​ ​ASR​ ​Envelopes This​ ​is​ ​a​ ​simple​ ​patch​ ​that​ ​uses​ ​the​ ​Quadra​ ​as​ ​two​ ​ASR​ ​envelope​ ​generators​ ​for​ ​a​ ​basic synthesizer​ ​voice.​ ​The​ ​reason​ ​ASR​ ​is​ ​chosen​ ​over​ ​AD​ ​in​ ​this​ ​example​ ​is​ ​because​ ​ASR​ ​will sustain​ ​as​ ​long​ ​as​ ​the​ ​keyboard​ ​key​ ​is​ ​held​ ​down.​ ​This​ ​is​ ​because​ ​an​ ​ASR​ ​envelope​ ​has​ ​a sustain​ ​section​ ​that​ ​stays​ ​high​ ​as​ ​long​ ​as​ ​the​ ​input​ ​gate​ ​is​ ​high.​ ​Once​ ​the​ ​keyboard​ ​key​ ​is released​ ​and​ ​the​ ​input​ ​gate​ ​goes​ ​low,​ ​the​ ​envelope​ ​will​ ​move​ ​into​ ​its​ ​decay​ ​phase,​ ​which​ ​in ASR​ ​mode​ ​is​ ​referred​ ​to​ ​as​ ​release.​ ​ASR​ ​stands​ ​for​ ​Attack,​ ​Sustain,​ ​Release. Page​ ​14

Patch​ ​2:​ ​Basic​ ​West​ ​Coast​ ​Voice​ ​(Requires​ ​Expander) This​ ​patch​ ​uses​ ​the​ ​Expander​ ​for​ ​its​ ​CV​ ​inputs​ ​as​ ​well​ ​as​ ​Quadrature​ ​mode​. A​ ​simple​ ​example​ ​of​ ​what​ ​is​ ​referred​ ​to​ ​as​ ​a​ ​“West​ ​Coast”​ ​voice.​ ​As​ ​with​ ​most​ ​west​ ​coast​ ​style patching,​ ​a​ ​filter​ ​is​ ​not​ ​used​ ​for​ ​timbre​ ​control,​ ​instead​ ​linear​ ​frequency​ ​modulation​ ​(FM)​ ​is​ ​used in​ ​a​ ​two-operator​ ​FM​ ​configuration.​ ​Quadra’s​ ​function​ ​1​ ​in​ ​AD​ ​mode​ ​controls​ ​the​ ​amount​ ​of harmonics​ ​by​ ​controlling​ ​VCA​ ​1’s​ ​level.​ ​Quadra’s​ ​function​ ​2​ ​also​ ​in​ ​AD,​ ​and​ ​VCA​ ​2​ ​are​ ​used​ ​for the​ ​final​ ​output​ ​volume.​ ​Make​ ​sure​ ​you​ ​adjust​ ​the​ ​pitch​ ​of​ ​VCO​ ​1​ ​to​ ​alter​ ​the​ ​harmonics produced​ ​by​ ​VCO​ ​2. Although​ ​a​ ​sequencer​ ​is​ ​used​ ​in​ ​this​ ​example,​ ​a​ ​keyboard​ ​could​ ​be​ ​used​ ​instead.​ ​Adding​ ​more LFOs​ ​and​ ​sequencers​ ​to​ ​various​ ​timbre​ ​shaping​ ​parameters​ ​such​ ​as​ ​VCO​ ​1​ ​pitch​ ​and​ ​Quadra’s attack​ ​and​ ​decay​ ​CV​ ​inputs​ ​is​ ​definitely​ ​worth​ ​trying. Page​ ​15

Patch​ ​3:​ ​Kick​ ​Drum This​ ​is​ ​a​ ​very​ ​simple​ ​patch​ ​that​ ​will​ ​produce​ ​a​ ​nice​ ​snappy​ ​kick​ ​drum​ ​depending​ ​on​ ​the​ ​VCO used.​ ​A​ ​self​ ​oscillating​ ​VCF​ ​can​ ​also​ ​be​ ​used,​ ​for​ ​example​ ​the​ ​Intellijel​ ​Korgasmatron​ ​makes excellent​ ​fat​ ​kicks​ ​with​ ​a​ ​bit​ ​of​ ​Q​ ​drive​ ​since​ ​it​ ​is​ ​not​ ​a​ ​true​ ​sine​ ​wave. First​ ​take​ ​the​ ​sine​ ​wave​ ​output​ ​of​ ​your​ ​VCO​ ​and​ ​patch​ ​it​ ​into​ ​your​ ​VCA.​ ​Then​ ​patch​ ​the​ ​same trigger​ ​from​ ​a​ ​sequencer​ ​or​ ​other​ ​source​ ​into​ ​Quadra’s​ ​TRIG​ ​1​ ​and​ ​TRIG​ ​2​ ​inputs.​ ​Patch​ ​ENV​ ​1 into​ ​the​ ​pitch​ ​input​ ​on​ ​your​ ​VCO,​ ​using​ ​an​ ​attenuator​ ​if​ ​the​ ​oscillator​ ​does​ ​not​ ​have​ ​an attenuator​ ​on​ ​the​ ​pitch​ ​or​ ​FM​ ​input.​ ​Without​ ​reducing​ ​the​ ​range​ ​of​ ​the​ ​AD​ ​signal,​ ​the​ ​kick​ ​will sound​ ​more​ ​like​ ​a​ ​zap​ ​than​ ​a​ ​snap.​ ​ENV​ ​2​​ ​connects​ ​to​ ​the​ ​CV​ ​input​ ​of​ ​your​ ​VCA​ ​to​ ​control​ ​the amplitude​ ​of​ ​the​ ​sound.​ ​Both​ ​ADs​ ​should​ ​be​ ​set​ ​with​ ​a​ ​fast​ ​attack​ ​and​ ​a​ ​medium​ ​decay,​ ​with​ ​the pitch​ ​decay​ ​shorter​ ​than​ ​the​ ​amplitude​ ​decay.​ ​To​ ​reduce​ ​clicks,​ ​slow​ ​down​ ​the​ ​attack​ ​of​ ​the​ ​AD feeding​ ​the​ ​VCA.​ ​Try​ ​starting​ ​at​ ​9​ ​o’clock.​ ​Adjust​ ​the​ ​pitch​ ​of​ ​your​ ​VCO​ ​and​ ​the​ ​attenuator​ ​until you​ ​get​ ​a​ ​nice​ ​boomy​ ​tone.​ ​Then​ ​adjust​ ​the​ ​Quadra’s​ ​AD​ ​times​ ​until​ ​you​ ​get​ ​the​ ​shape​ ​and timbre​ ​of​ ​the​ ​kick​ ​that​ ​you​ ​desire. Page​ ​16

Technical​ ​Specifications Width 6​ ​hp Maximum​ ​Depth 44​ ​mm Current​ ​Draw 52​ ​mA​ ​@​ ​+12V 5​ ​ ​ ​mA​ ​@​ ​-12V Page​ ​17