# IO Labs — Flux Sequencer - [Manual PDF](../../manuals/IO Labs - Flux Sequencer - 107 User Manual.pdf) --- [Manual PDF](attachment) # Using IOLabs Flux to Create Melodic Components in a Eurorack System Flux is presented primarily as a **4-channel rhythm sequencer**, but the manual makes it clear that it can also be a very capable **melodic control source** when you treat its CV lanes, quantization, modulation buses, and auxiliary trigger logic as pitch-and-phrase tools rather than only percussion tools. ## What Flux gives you for melody Each of the 4 channels includes: - **1 main rhythm output** - **2 auxiliary rhythm outputs** - **1 CV output** So across the module you effectively get: - **4 independent CV lanes** - **12 trigger/gate lanes** total if you count main + aux outputs per channel That combination is enough to build complete melodic structures: - pitch CV - note gates - accent/variation gates - transposition or articulation modulation - phrase resets and derived clocks ## The key melodic features in the manual ### 1. Per-step CV sequencing On **Main UI Page 2: CV Outs**, each step can output one of several CV modes: - **VOLT** — fixed voltage per step - **LFO** — free-running modulation source - **ENV+ / ENV-** — envelope shapes - **RANDS** — random voltage once per step - **RANDT** — random voltage once per trigger within a step For melody, **VOLT** is the most direct pitch sequencer mode. Set a channel’s CV output to **VOLT**, then program **MAXV** per step as your note value. Because each step has independent values, you can create: - basslines - lead melodies - repeating motifs - transposition sequences ### 2. Built-in quantization Flux’s CV output includes **per-step quantization** via: - **QUAN** — number of equally spaced nodes per volt, from 1–24 - **QUAN NODES** — enable/disable individual notes in that division This is extremely useful for melodic work. Examples: - Set **QUAN = 12** for semitone division across each volt - Turn on only scale tones in **QUAN NODES** to create a custom scale - Change quantization settings per step for modal movement or unusual harmonic behavior This means Flux can behave like: - a pitch sequencer - a scale-locked melody generator - a constrained random melodic source ### 3. Per-step voltage range Each step has: - **MINV** - **MAXV** For melody this is powerful because you can define: - fixed pitch by setting VOLT mode and using MAXV - pitch windows for random generation in **RANDS** or **RANDT** - limited register zones for phrases For example: - bass channel: keep MINV/MAXV low - lead channel: set higher voltage range - harmony channel: use same quant scale, different voltage span ### 4. Trigger generation for note articulation Flux’s main strength is timing. Its rhythm engine can generate very intricate trigger structures using: - **DENS** - **CURV** - **VAL** - **LENG** - **PHAS** - **COMP** - **MASK** - **PROB** - **HUMA** For melody, these parameters do not just make rhythms—they shape **note articulation**. Patch idea: - CV out → oscillator pitch input - main rhythm out → envelope gate or LPG trigger Then Flux determines: - **which pitch** is heard via CV - **when it is heard** via trigger output This lets you make melodies that are: - straight and clocked - ratcheted - polyrhythmic - sparse - humanized - probability-based ## Practical melodic patching strategies --- ## 1. Basic 1V/oct melodic sequencer ### Patch - **Channel CV out** → oscillator **1V/oct** - **Channel main rhythm out** → envelope gate in - **Envelope out** → VCA CV in - **Oscillator audio** → VCA → mixer/filter ### Setup - On CV page, set **CVSEL = VOLT** - Set **QUAN = 12** - Enable desired scale degrees in **QUAN NODES** - Program per-step **MAXV** values - On rhythm page, set note timing with: - **DENS = 1** for one note per step at first - adjust **LENG** for note duration framework - use **GATE** to control note length feel ### Result Flux acts like a melodic step sequencer, but with more flexible timing than a standard 16-step pitch sequencer. --- ## 2. Ratcheting melodic lines Because trigger density can exceed 1 per step, a single step can generate multiple note events. ### Patch - CV out → oscillator 1V/oct - Main rhythm out → envelope gate ### Setup - Use **CVSEL = VOLT** - For selected steps increase **DENS** - Experiment with **CURV** and **VAL** - **VAL = 0** gives even subdivisions - positive/negative values skew trigger spacing - Adjust **GATE** for tight plucks or longer ties ### Result You get: - repeated notes - clustered attacks - accelerating/decelerating note bursts - ornamental melodic figures This is especially effective for: - Berlin-school lines - IDM-style ratchets - generative arpeggio embellishments --- ## 3. Quantized random melody generator ### Patch - CV out → oscillator 1V/oct - Main output → envelope gate ### Setup - Set **CVSEL = RANDS** for one random note per step or **RANDT** for a new random note on every trigger - Set **MINV/MAXV** to constrain register - Set **QUAN = 12** - Use **QUAN NODES** to define the scale - Use **PROB**, **MASK**, and **DENS** to control phrase density ### Result This creates scale-constrained generative melodies. Use: - **RANDS** for stable note-per-step random sequencing - **RANDT** for volatile, trigger-level melodic motion This is one of the strongest melodic uses of Flux. --- ## 4. Four-part melodic system Because Flux has **4 channels**, it can function as a small compositional brain for multi-voice music. ### Example allocation - **CH1**: bassline pitch + gate - **CH2**: lead melody - **CH3**: harmony or countermelody - **CH4**: modulation lane or additional voice ### Possible patching - Each channel CV out → separate oscillator or voice 1V/oct - Each channel main output → each voice envelope gate - AUX outputs → accents, resets, chord changes, clocking other modules ### Result You can create: - interlocking melodic polyrhythms - canon-like patterns - polymetric harmony - percussion-plus-melody hybrids Because each channel has independent loop points and timing behavior, voices can cycle against one another. --- ## 5. Using AUX outputs as melodic articulators Each channel has **AUX1** and **AUX2** with many modes, including: - delayed copies - first/last trigger - start-of-step - dividers - boolean logic - clock divisions - CV threshold comparisons For melody, AUX outs are excellent for: - accents - opening a second envelope - switching wavefolders or filters - clocking sample-and-hold - triggering octave jumps or transposition events - selectively firing a second oscillator layer ### Example - Main out triggers the note envelope - AUX1 triggers a second, shorter envelope to open a filter only on selected steps - AUX2 sends a divider or logic-derived pulse to transpose another sequencer This can make a simple melody feel animated and phrased. --- ## 6. Melodic modulation with Macro Pots, CV inputs, and Evolve LFOs Flux has 3 modulation sources: - **Macro Pots** - **CV Inputs** - **Evolve internal LFOs** These can modulate many parameters including rhythm and CV behavior. ### Why this matters melodically You can modulate: - **MAXV / MINV** for transposition or pitch drift - **ATK / REL / ACUR / RCUR** for note shape - **DENS** for phrase activity - **VAL / CURV / COMP / PHAS** for articulation timing - **SHUF** for groove changes - even **BPM** in internal mode ### Musical uses - a macro knob for live transposition - CV input to animate note range - slow Evolve LFO to drift melody density over time - performance macros that move from sparse to busy lines The manual notes that modulation is controlled through **mod buses**: - Yellow - Grey - Purple Per step, you choose which bus affects it. That means modulation can be active on some steps and absent on others, which is very useful for melodic phrasing. ### Example phrase design - Put transposition modulation only on steps 5–8 - Apply density modulation only to end-of-bar steps - Apply CV modulation to one phrase section but not another This creates evolving melody with intentional structure. --- ## 7. Envelopes and LFOs as melodic support signals The CV outputs are not limited to pitch. A channel can instead generate: - **AR envelopes** - **inverted envelopes** - **free-running LFOs** So one channel can sequence melody, while another channel’s CV out can modulate: - filter cutoff - wavefold amount - FM index - VCA level - stereo placement ### Melodic use case - CH1 CV = pitch for oscillator A - CH1 main out = note gate - CH2 CV = synced envelope controlling filter - CH2 main or AUX = accent trigger Now Flux is doing both pitch and expression. --- ## 8. Scale-based melodic probability and masking The rhythm side includes: - **PROB** - **MASK** - **MSK>** - **LOOP** - **STEP on/off** - **GEN** on/off generator For melody, these functions create phrase variation. ### Good uses - **PROB St**: occasionally skip an entire note group - **PROB Tr**: probabilistically thin ratchets within a step - **MASK**: create repeating omission patterns - **LOOP**: set shorter phrase loops inside longer harmonic movement - **ON/OFF generator**: algorithmically create active/inactive steps If the pitch stays the same but note occurrence changes, you get melodic variation without reprogramming the line. --- ## 9. Shuffle and humanization for melodic groove The module provides: - **SHUF** - **SH16** - **HUMA** These are often thought of as drum tools, but they are equally important for melody. Use them to make: - basslines swing - leads feel less rigid - arps become more playable and human A very mechanical pitch sequence can become musically convincing with just subtle timing movement. --- ## 10. Burst mode for triggered melodic phrases In **BURST** mode, a channel’s step can be triggered from gate inputs or MIDI notes. This can be used for melodic bursts or ornaments. ### Patch concept - External keyboard gate / sequencer pulse into gate input - Flux in Burst mode - CV out to oscillator pitch - Main output to envelope gate ### Result Each incoming trigger can launch: - a ratcheted note burst - a predesigned ornament - a short melodic flourish This is great for: - fills - grace-note clusters - responsive live performance phrases --- ## Best melodic workflows from the manual ## Workflow 1: Flux as a classic melody sequencer Use: - **CVSEL = VOLT** - **QUAN = 12** - **QUAN NODES** = scale - **DENS = 1** - main out as note gate This gives you a stable, scale-aware melodic sequencer. ## Workflow 2: Flux as a generative melodic composer Use: - **CVSEL = RANDS or RANDT** - quantization enabled - probability, masking, and modulation buses active - AUX outputs for accents and phrase changes This gives you self-varying melodic material. ## Workflow 3: Flux as melody + articulation brain Use one channel for pitch and note gate, and the AUX outs for: - accent triggers - filter pings - phrase resets - clock divisions This turns one melodic line into a complete articulated performance lane. ## Workflow 4: Flux as a 4-voice polymetric melody engine Use all 4 channels with different: - loop lengths - quantization scales - step lengths - densities - shuffle amounts This creates layered melodic counterpoint. --- ## Especially strong pairings with other Eurorack module types Flux will work particularly well with: ### Oscillators / voices with 1V/oct input Use CV outs for pitch and main outs for note triggers. ### Quantizer-adjacent voices Flux already has internal quantization, so it works especially well with voices that want clean stepped pitch CV. ### LPGs and percussion voices Because Flux is rhythm-centric, it excels at plucked and percussive melodic patches. ### Sequential switches Use AUX logic/dividers to switch between oscillators, timbres, or transposition sources. ### Sample & hold / shift register modules RANDT and AUX clocks can feed or synchronize generative melodic systems. ### VCAs and filters Use additional CV channels or envelope modes for dynamic shaping of melodic voices. ### MIDI-connected systems The manual notes MIDI I/O support from v1.06 onward, including clocks, note outs, and control messages, so Flux can coordinate melodic structures across modular and external synths. --- ## Important caveats for melodic use The manual warns about parameters that can cause silence. For melodic patches, watch out for: - **DENS = 0** - **MASK** muting all effective triggers - **PHAS** pushing triggers outside step boundaries - **negative COMP** expanding triggers beyond step length - **MOD = OFF** if you expect macro/CV modulation on that step If a melodic line disappears, these are the first things to check. Also note: - the CV output range is **0–8V** - many oscillators expect **1V/oct**, so this is musically useful, but you may want to constrain the range to avoid excessively wide pitch spans - use **MINV/MAXV** carefully to keep melodies in register --- ## A few concrete melodic patch recipes ## 1. Scale-locked bassline - CH1 CV out → bass oscillator 1V/oct - CH1 main out → envelope gate - CH1 CVSEL = VOLT - QUAN = 12 - enable minor scale notes in QUAN NODES - DENS = 1 - SHUF slightly above 0 Result: tight bassline with swing. ## 2. Generative lead - CH2 CV out → lead voice 1V/oct - CH2 main out → envelope gate - CVSEL = RANDS - MINV/MAXV limited to 1–3V equivalent range - QUAN = 12 with pentatonic nodes enabled - PROB < 100 - HUMA moderate - AUX1 = DEL or 1st for accents Result: melodic but controlled random lead phrasing. ## 3. Ratcheting arp - CH3 CV out → oscillator pitch - CH3 main out → envelope gate - CVSEL = VOLT - some steps with high DENS - CURV and VAL adjusted for acceleration/deceleration - AUX output triggers filter envelope Result: animated arpeggio line with timbral articulation. ## 4. Harmony drone with motion - CH4 CV out = LFO or ENV to modulate filter/FM on another voice - AUX outs provide divider clocks or logic gates - another channel handles pitch Result: Flux provides harmonic motion and expression, not just notes. --- ## Bottom line Flux can absolutely be used to create **melodic components**, not just drum patterns. Its most useful melodic strengths are: - **4 independent CV/gate sequencing lanes** - **per-step fixed or random voltages** - **built-in quantization and selectable quantization nodes** - **complex rhythmic articulation** - **AUX outputs for accents, dividers, logic, and phrase control** - **deep modulation via macros, CV inputs, and internal LFOs** - **per-step modulation bus assignment for structured variation** In practice, Flux is best understood as a **composition and articulation engine**: it can generate pitch, timing, dynamics, variation, and phrase structure all at once. If paired with oscillators, VCAs, filters, and envelopes, it can drive entire melodic and harmonic systems with a level of rhythmic sophistication that most pitch sequencers do not offer. [Generated With Eurorack Processor](https://github.com/nstarke/eurorack-processor)