# Fancyyyyy — K-Accumulator Digital Complex Oscillator - [Manual PDF](../../manuals/K_ACCUMULATOR_Quickstart_v1.02.pdf) --- [Manual PDF](https://fancysynthesis.net) # K-ACCUMULATOR modulation ideas for distorted percussion, basslines, and haunted pads K-ACCUMULATOR is unusually rich because it is not just “an oscillator with some FM.” It is a whole internal ecosystem: - main OSC with multiple waveshaping domains - Mod oscillator for PM/XPM behavior - UFG as envelope/LFO/audio oscillator - Δ–∑ pattern generator for stepped/smoothed modulation - internal normalled routing to many CV inputs That means the best sounds usually come from **stacking small modulations in several places at once**, not maxing one knob. A useful mindset: 1. Start from **Centre** 2. Choose a **Morph mode** 3. Pick one internal mod source: - **UFG** for organic motion, envelopes, pulses - **Δ–∑** for stepped instability and evolving sequences 4. Add one external CV if desired 5. Use **Stretch** and **Damped/Pulsar** as “make it strange” controls --- ## First: the best general modulation strategies ## 1. Use the internal normalisations aggressively On the OSC section, the CV inputs/attenuverters are internally normalled from either: - **UFG** when the LED is unlit - **Δ–∑** when the LED is lit So even without patching cables, you can modulate: - Shift - Depth - Shape - Morph - 1V/TZ This is the fastest way to find complex timbres. ### Great default trick - Set **one waveshaper attenuverter positive** - Set **another slightly negative** - Feed one from **UFG** - Feed the other from **Δ–∑** This creates counter-motion inside the oscillator, which often sounds much more alive than moving everything in the same direction. --- ## 2. Morph slowly, shape quickly The Morph system is continuous, but the character of the controls changes depending on which path you’re on. ### Best approach - Use **Morph** as a slow macro movement - Use **Shift/Depth/Shape** as faster or performance controls This works because: - Morph changes the topology - Shift/Depth/Shape exploit the current topology For performance, try: - slow Δ–∑ or UFG to Morph - manual performance on Depth and Shape - light modulation on Shift --- ## 3. Use small modulation depths first This module seems designed so that **small amounts of modulation can produce large spectral changes**. Especially in: - XPM / XPM2 - FBPM2 - high Damped/Pulsar settings - high Stretch with active shaping For punchy results: - keep attenuverters around 9–10 o’clock or 2–3 o’clock first - only push further once the base patch is good --- # Best Morph modes by sound goal ## For distorted percussion Best starting modes: - **FBPM**: stable, clear, sine-to-saw distortion - **2OP**: controlled mod-oscillator aggression - **FBPM2**: chaotic and nasty - **Asym**: brittle, granular, clicky, unusual ## For dubstep / DnB bass Best starting modes: - **XPM**: filthy but still playable - **XPM2**: more separated controls, highly designable - **2OP2**: good for “speaking” basses - **FBPM** with Stretch: great for reese-adjacent spectral tearing ## For haunted pads Best starting modes: - **FMNT**: formant-like, vocal, airy - **2OP**: smooth animated harmonic motion - **Asym**: eerie and unstable if used gently - **XPM** at low depth: slowly evolving spectral bloom --- # Distorted percussive sounds These patches lean on **UFG as envelope/pulse source** and **Damped/Pulsar** for internal sync/amplitude shaping. ## Patch idea 1: metallic distorted kick / tom ### Goal A low fundamental with a sharp distorted transient and internal pitch snap. ### Setup - Start from **Centre** - Route **Root to OSC** - Set OSC frequency low - Set Morph to **FBPM** or **2OP** - Turn up **Damped/Pulsar** to medium-high - Set **UFG Time** to sub-audio, single-shot or looping slowly - Use **raised cosine or exponential-ish UFG shape** - Add a bit of **Depth** - Add a little **Shape** - Keep **Stretch** low at first ### Modulation ideas - Send **UFG to 1V/TZ** with positive attenuverter for a pitch envelope - Send **UFG to Depth** lightly for attack-only distortion bloom - Send **Δ–∑ to Shape** very lightly for changing attack character each hit ### Why it works - Damped/Pulsar gives sync plus AM, making the transient more percussive - 1V/TZ from UFG gives the classic downward pitch strike - FBPM/2OP gives controlled harmonic smear without losing impact ### Push it further - In **2OP**, tune Mod to a non-octave harmonic - Add slight **Detune** - Increase **Shape** - Add a touch of **Stretch** for weird overtone tearing while preserving low pitch This can move from kick/tom into broken industrial drum territory. --- ## Patch idea 2: snare / clap / noise-burst style percussion ### Setup - Morph to **Asym** or **FBPM2** - Root/OSC in midrange - UFG in triggered one-shot mode - **Damped/Pulsar** high - **Depth** medium - **Shape** medium to high - **Shift** low to medium ### Modulation ideas - UFG to **Damped/Pulsar CV** if available externally, or just perform manually - Δ–∑ to **Morph** lightly - Δ–∑ to **Shift** or **Shape** - Mod oscillator tuned to inharmonic interval with slight detune ### Result You’ll get: - noisy broadband crack - unstable upper harmonics - changing “snare wires” texture if Δ–∑ is moving Shape or Morph ### Performance move Shorten UFG Time and increase Damped/Pulsar toward max: - lower values = papery percussion - higher values = hard synced tearing snap --- ## Patch idea 3: glitch hats and digital shards ### Setup - High OSC frequency - Morph in **Asym**, **XPM2**, or **FBPM2** - UFG as high-speed trigger or audio-rate modulator - Very little low end - Shape and Shift active - Stretch moderate ### Modulation ideas - Δ–∑ to **1V/TZ** for stepped micro-pitch chatter - UFG to **Depth** - Morph lightly modulated - Mod tracking OSC, harmonic above center, Order biased toward odd harmonics ### Why it works At high frequencies, the PM/folding/stretch interactions create hat-like sidebands and digital splatter. --- # Dubstep / drum & bass basslines K-ACCUMULATOR seems excellent for bass because it can keep a strong root while heavily altering upper harmonics. ## Core bass design principle For basses, start by protecting the fundamental: - Keep the fundamental low and stable - Use **Stretch** to move harmonics while keeping the root - Use **Shift** for harmonic blending - Use **Depth/Shape** for aggression - Use **Morph** and Mod tuning for vowel/talking motion --- ## Patch idea 4: modern talking neuro bass ### Setup - Start from Centre - Route **Root to OSC** - Quantize if you want a playable scale - Morph to **XPM** or **XPM2** - Tune main OSC low - Set Mod to track **OSC** - Harmonic above center, around 2nd–5th harmonic region - Add slight **Detune** ### Sound design - **Depth** = PM intensity - **Shape** = extra fold or XPM index depending on mode - **Shift** = harmonic emphasis / damping depending on mode - **Stretch** = medium ### Modulation - **Δ–∑ to Morph** lightly - **UFG to Shift** or **Shape** - **Δ–∑ to 1V/TZ** for sequenced pitch - Use **Scale quantisation** for locked riffs - Set **Q.Trig on** with Root tracking and scale active for auto-arpeggiated behavior ### Best movement recipe - slow UFG to one timbre axis - stepped Δ–∑ to another - manual performance on Morph This gives the classic “talking / yawing / barking” bass behavior. --- ## Patch idea 5: reese-ish tearing bass ### Setup - Morph to **FBPM**, **2OP**, or **XPM** - Low OSC frequency - Mod tracks OSC - Harmonic set close to fundamental or low harmonic - **Detune** slightly off center - **Depth** medium - **Shape** low-medium - **Stretch** medium-high ### Why this is strong here Detune affects both: - Mod oscillator relationship - harmonic wavefolder animation That means one control can create moving internal beating and tearing. ### Modulation ideas - Slow UFG to **Detune** externally if possible - Δ–∑ to **Stretch** or **Shape** - UFG to **Depth** - external slow LFO to Morph ### Character - mild detune = thick reese - more stretch = spectral ripping - more depth = aggressive, metallic edge - morph toward XPM = more vocal and unstable --- ## Patch idea 6: wobble bass that avoids sounding generic Instead of only modulating filter cutoff externally, use the internal structure. ### Setup - Morph in **2OP2** or **XPM2** - Root to OSC - Mod tracks OSC - Set a useful harmonic relation - Damped/Pulsar low to medium - Stretch medium - Shape medium ### Modulation routing - UFG looping in tempo-synced LFO range - UFG to **Depth** - UFG or Δ–∑ to **Morph** - opposite-polarity modulation to **Shift** - Δ–∑ to **1V/TZ** for phrase movement ### Trick Use **Skew** and **Shape** on the UFG to alter how the wobble feels: - ramp = aggressive forward lurch - triangle/linear = even sweep - raised cosine = rounded breathing - exponential = punchy “grab” This makes the bass movement feel less like a standard LFO/filter wobble and more like spectral articulation. --- ## Patch idea 7: sub bass with violent top layer ### Setup - Keep OSC tuned low - Use moderate **Depth** - Low-medium **Shape** - Moderate-high **Stretch** - Morph in **FBPM** or **2OP** - Damped/Pulsar low ### Modulation - Δ–∑ to **Shift** - UFG to **Shape** - very light Morph modulation - quantized pitch via Root/Scale ### Why it works Stretch can move harmonics while keeping the fundamental stable, which is perfect for bass music where the sub must stay anchored while the top end mutates. --- # Haunted atmospheric pads This module is stereo by design at the main sine/cosine outputs, so it should excel at spatial pads. ## Main pad strategy For pads: - use the stereo sine/cosine outs as a pair - keep modulation slow - use small modulation amounts - let several parameters drift independently - avoid too much Damped/Pulsar unless you want tremolo/pulsar texture --- ## Patch idea 8: ghost choir pad ### Setup - Start at Centre - Morph to **FMNT** - Root to OSC and maybe UFG too - Tune to low-mid register - Depth low-medium - Shift low - Shape low-medium - Stretch low ### Modulation - UFG looping slowly - UFG to **Depth** - Δ–∑ smoothed and very light to **Morph** - Δ–∑ or slow external CV to **Shift** - Mod oscillator tuned to a consonant ratio or scale degree ### Why it works FMNT uses raised-cosine AM and PM to create formant-like spectra, so small modulations create vocal/choir movement without needing filters. ### Extra haunting move Use **Just Intonation** scales and scan scale choices around center/right side for less familiar harmonic spacing. --- ## Patch idea 9: drifting horror pad ### Setup - Morph to **Asym** or low-depth **XPM** - Main pitch fairly low - Mod tracks Root or OSC - Harmonic set to a strange interval - Detune slightly off center - Stretch low-medium - Damped/Pulsar very low or off ### Modulation - Δ–∑ clocked slowly by UFG - Increase **Smooth** on Δ–∑ so it glides - Route Δ–∑ to **Morph** and/or **1V/TZ** lightly - Route UFG to **Shape** with shallow amount - Use negative modulation on one parameter and positive on another ### Result - unstable harmonic fog - slight melodic drift - quasi-organic spectral breathing - eerie tonal asymmetry --- ## Patch idea 10: pulsar-cloud ambient wash ### Setup - Morph to **FMNT** or **2OP** - UFG in looping mode at slow to medium rate - **Damped/Pulsar** medium-high - OSC in mid register - Shape low-medium - Depth low-medium ### Modulation - Use UFG as the pulsar window via Damped/Pulsar - Slowly modulate **UFG Shape** and **Skew** - Δ–∑ to **Morph** lightly - Δ–∑ Smooth above halfway for flowing transitions - Stretch a little to separate upper harmonics from the root ### Why it works The manual explicitly describes UFG as: - modulation source - pulsar window generator - clock for Δ–∑ When all three are linked, you get self-coherent motion that feels composed rather than random. --- # Specific advanced tricks ## 1. Use Q.Trig for self-generating rhythmic bass/arps If: - Root is routed to OSC - a scale is enabled - Q.Trig is active then a trigger is sent to UFG whenever oscillator frequency crosses a quantizer threshold. ### Try this - Patch an LFO or Δ–∑ into **1V/TZ** - Set **Damped/Pulsar** high - Put UFG in non-looping mode Now pitch movement can generate rhythmic triggers/envelopes internally. This is great for: - bubbling bass sequences - auto-arpeggiation - semi-chaotic percussion --- ## 2. Use external audio into Ext. Sync/Track The external input can do: - sync - pitch tracking ### Creative uses - Feed a drum loop, voice, or another oscillator - In **Track** mode, the OSC follows incoming pitch but keeps its own timbre system - Then use Morph/Depth/Shape/Stretch on that tracked pitch This can make: - voice-following demonic drones - bass that tracks external riffs but becomes alien - percussion locked to another sound source’s motion For haunted material, feed vocals or field recordings with pitch content. --- ## 3. Audio-rate UFG modulation The UFG tracks into audio rate and has anti-aliased output. ### Try - set UFG to audio rate - route it internally to Shift, Depth, Shape, or 1V/TZ - use small attenuation This will add a more “synth-operator” quality than simple LFO motion: - buzzy bass articulation - metallic percussion - animated formants in pads --- ## 4. Δ–∑ as both sequencer and timbre source The Δ–∑ is more interesting than a normal random sequencer because: - it derives from delta-sigma encoding of Mod - has non-destructive mutation - can be stepped or smoothed - behaves differently at audio rates ### Good uses - to **1V/TZ** for riffs - to **Morph** for evolving timbral structure - to **Shape** or **Shift** for note-by-note articulation changes ### Best trick Lock a good sequence with **Chance at minimum**, then: - raise Chance temporarily for mutations - drop it back to restore the original This is perfect for live basslines: controlled chaos with a reset point. --- # Practical recipe sets ## Recipe A: distorted industrial kick - Morph: FBPM - OSC low - UFG: one-shot, fast decay shape - UFG → 1V/TZ positive - UFG → Depth slight - Damped/Pulsar: medium-high - Shape: low-medium - Stretch: low - Optional Δ–∑ → Shape tiny amount --- ## Recipe B: snarling neuro bass - Morph: XPM2 - Mod tracks OSC - Harmonic: 2nd–4th region - Detune: slight - Depth: medium-high - Shift: low-medium - Shape: medium - Stretch: medium - Δ–∑ → Morph - UFG → Depth or Shift - Root scale quantized for riffs --- ## Recipe C: reese with spectral tear - Morph: 2OP or FBPM - Mod tracks OSC - Harmonic near fundamental - Detune slightly off center - Depth medium - Shape low - Stretch medium-high - slow UFG to Shape - slow Δ–∑ to Shift - external saturation after module if desired --- ## Recipe D: haunted choir - Morph: FMNT - stereo outs to reverb - Depth low-medium - Shape low - Shift low - slow UFG → Depth - smoothed Δ–∑ → Morph tiny amount - JI scale selected - slight Detune --- ## Recipe E: broken alien hats - Morph: Asym or FBPM2 - OSC high - Damped/Pulsar high - UFG triggered quickly - Shape medium-high - Shift medium - Δ–∑ → 1V/TZ tiny - Mod high harmonic with odd spread - Stretch moderate --- # Best control interactions to explore ## Shift + Stretch This is one of the most unique pairings on the module. - **Shift** introduces blended harmonic frequency shifting - **Stretch** frequency-shifts generated harmonics while holding the fundamental Use this for: - basses with stable sub and moving top - metallic percussion - widening, detuned-feeling pads without destabilizing pitch --- ## Depth + Shape Usually the most immediate “distortion pair.” - **Depth** often introduces PM with damping - **Shape** often introduces harmonic wavefolding Use: - more Depth for internal pressure/aggression - more Shape for visible folds/edges On percussion: - modulate Depth with UFG envelope - leave Shape more static On bass: - modulate Shape slowly - play Depth manually --- ## Damped/Pulsar + UFG Time/Shape/Skew This is your secret weapon for percussive and animated sound. - Time = rate or envelope length - Shape = contour character - Skew = asymmetry/pulse geometry - Damped/Pulsar = how much that contour invades the OSC This can create: - kicks - plucks - tremolo clouds - hard-sync tearing - pseudo-granular pulses --- ## Harmonic + Order + Detune on Mod This cluster determines how “intelligent” the mod oscillator relationship feels. ### Suggestions - **Order near center**: more blended harmonic behavior - **Order toward odd/even**: more selective overtone families - **Order max**: scale-locked or integer-ratio behavior - **Detune slight**: movement and growl - **Detune larger**: instability and tearing Excellent for bass and evolving pads. --- # If I were patching it for your three goals ## 1. Distorted percussion starter patch - Morph: FBPM2 - OSC: low-mid - UFG: triggered one-shot - Damped/Pulsar: 2–4 o’clock - UFG to 1V/TZ positive - UFG to Depth slight - Δ–∑ to Shape tiny - Mod detuned inharmonically ## 2. Dubstep / DnB bass starter patch - Morph: XPM2 - Root quantized - Δ–∑ to 1V/TZ - UFG looped in tempo - UFG to Shift - Δ–∑ to Morph - Stretch up until the top starts talking - Shape to taste - Detune slightly off center ## 3. Haunted pad starter patch - Morph: FMNT - stereo outs hard left/right - UFG slow looping - UFG to Depth light - smoothed Δ–∑ to Morph very light - Shift barely on - Shape barely on - JI scale - huge reverb after --- # Final advice K-ACCUMULATOR seems to reward this exact workflow: 1. Return to **Centre** 2. Pick a **Morph mode** for the general voice 3. Add **one** shaper 4. Add **one** modulation source 5. Add **Stretch** 6. Add **Damped/Pulsar** 7. Only then start moving Mod harmonic relationships That order tends to preserve intention while still getting into wild territory. If you want, I can also turn this into: - a **cheat sheet by panel section** - **10 exact knob-position patches** - or a **performance-oriented patch guide** for techno / dubstep / ambient sets. [Generated With Eurorack Processor](https://github.com/nstarke/eurorack-processor)