Sealegs

Intellijel 20HP
fw 1.3
DELAY REVERB EFFECTS CHORUS

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Multi-modeled stereo character delay with reverb. Three delay models (TAPE, BBD, DIGI) with per-model COLOR degradation; built-in syncable modulator (7 waveshapes + wow/flutter + envelope followers); feedback-loop VCF; spacious Fog reverb with repositionable signal-chain insertion.

Patch Ideas · 8

★ Dub delay with tone-darkening repeats
Audio → IN L · MODEL BBD · COLOR ~50% · FB 60% · HPF low, LPF ~3 o'clock · DELAY SYNC to external clock · each repeat darkens progressively · live LPF tweaks dub-style
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 4 connections. Modules: Sealegs, Clock, Synth, Output. Signals: 3 audio, 1 clock.SealegsClockSynthOutputMODEL: BBD · COLOR: 50% · FB: 60%STEREO: PONG · DELAY SYNC: ONIN LaudioCLKclkOUT LaudioOUT RaudioOutclkOutaudioLeftaudioRightaudioaudioclock
★ Shoegaze ambient wash
MODEL TAPE · COLOR high · FOG position MIX · FOG level high · decay long (ALT + FOG) · MOD = SINE, sync'd · slight DEPTH · MIX 70% wet · swelling tape reverb with gentle chorus
▸ Show diagram
Patch diagramPatch diagram with 3 modules and 3 connections. Modules: Sealegs, Pad, Output. Signals: 3 audio.SealegsPadOutputMODEL: TAPE · COLOR: highFOG POSITION: MIX · FOG: 70% · DECAY: longMOD: SINE synced · MOD DEPTH: 20%IN LaudioOUT LaudioOUT RaudioOutaudioLeftaudioRightaudioaudio
Karplus-Strong string
Short trigger burst → IN L · MODEL DIGI · TIME very short (S range) · FB 100%+ · HPF mid / LPF mid · pitched plucked string tones — each trigger excites the resonant feedback loop
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 5 connections. Modules: Sealegs, Noise, ENV, VCA, Trig, Output. Signals: 3 audio, 1 cv, 1 trigger.SealegsNoiseENVVCATrigOutputMODEL: DIGI · TIME RANGE: SFB: 100% · HPF/LPF: midIN LaudioOUT LaudioOutaudioGatetrigOutcvInaudioCVcvOutaudioOuttrigInaudioaudiocvtrigger
★ Sync'd ping-pong eighth-notes
Audio → IN L · STEREO CONFIG PONG · DELAY SYNC ON · TIME slider on 1/8 division · WIDTH adds 33% offset on right · FB 40% · classic rhythmic stereo delay that locks to tempo
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 4 connections. Modules: Sealegs, Clock, Synth, Output. Signals: 3 audio, 1 clock.SealegsClockSynthOutputSTEREO: PONG · MODEL: DIGIDELAY SYNC: ON · TIME: 1/8IN LaudioCLKclkOUT LaudioOUT RaudioOutclkOutaudioLeftaudioRightaudioaudioclock
MOD as rack-wide LFO
MOD knob SINE · MOD SYNC ON to master clock · MOD OUT → external filter cutoff · Sealegs also processes audio · one module gives you a clock-synced LFO and a delay simultaneously
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 4 connections. Modules: Sealegs, Clock, VCF, Audio, Output. Signals: 2 audio, 1 cv, 1 clock.SealegsClockVCFAudioOutputMOD: SINE · MOD SYNC: ONCLKclkIN LaudioMODcvOUT LaudioOutclkCutoffcvOutaudioInaudio11. tempo-synced LFOaudiocvclock
Envelope-follower pitch bend
Drum bus → IN L · MODEL TAPE · MOD = EF+ · MOD DEPTH ~30% · RATE slider mid · loud hits push delay time briefly, creating pitch-bend artifacts that lock to the performance
▸ Show diagram
Patch diagramPatch diagram with 3 modules and 3 connections. Modules: Sealegs, Drums, Output. Signals: 3 audio.SealegsDrumsOutputMODEL: TAPEMOD: EF+ · DEPTH: 30% · RATE: midIN LaudioOUT LaudioOUT RaudioOutaudioLeftaudioRightaudioaudio
Digital-freeze granular freeze chord
Play a chord · MODEL DIGI · tap FREEZE at the peak · frozen buffer loops forever (DIGI holds exactly) · modulate HPF/LPF live to morph timbre of the frozen loop · play lead over it
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 4 connections. Modules: Sealegs, LFO, Chord, Output. Signals: 3 audio, 1 cv.SealegsLFOChordOutputMODEL: DIGI · FREEZE: ONIN LaudioLPF CVcvOUT LaudioOUT RaudioOutcvOutaudioLeftaudioRightaudioaudiocv
Crossed-feedback stereo chaos
Stereo source · STEREO CONFIG L/R with independent times · ALT + DELAY SYNC to enable FB CROSS · echoes ping back and forth between channels in non-repeating patterns · set L and R to prime-number ms times for evolving stereo
▸ Show diagram
Patch diagramPatch diagram with 3 modules and 4 connections. Modules: Sealegs, Synth, Output. Signals: 4 audio.SealegsSynthOutputSTEREO: L/R · FB CROSS: ONTIME: 287ms · WIDTH: 431msIN LaudioIN RaudioOUT LaudioOUT RaudioLaudioRaudioLeftaudioRightaudioaudio

Behaviors

Three delay models MODEL switch

TAPE emulates reel-to-reel warmth with saturation and drift. BBD emulates bucket-brigade companding with sample-rate instability. DIGI is clean digital — COLOR becomes bit-crush/SR reduction at extreme settings.

Model-dependent freeze FREEZE button/gate per MODEL

BBD freeze accumulates signal loss (limited sample rate). TAPE freeze holds better but slowly saturates. DIGI freezes the buffer exactly and is immune to modulation/time changes while frozen.

VCF in feedback loop HPF/LPF sliders (default · not frozen)

Filters sit inside the delay feedback path — repeats progressively darken/thin each pass. Ideal for dub-style cascading tone changes. When frozen, the VCF moves outside the loop and affects only the output.

Stereo configurations STEREO CONFIG switch

PONG sums L+R to mono and ping-pongs two serial delays. T:W runs delays in parallel with right offset by WIDTH. L/R runs both delays fully independently for true stereo — WIDTH/R directly sets right time.

Crossed feedback ALT + DELAY SYNC (FB CROSS)

Routes L feedback into R input and vice versa. Creates swapping stereo echoes; combined with L/R stereo config yields complex criss-crossing repeats.

FOG position shifts character FOG/DRIVE POSITION switch

IN position lets reverb feed the delay — reverb builds into each repeat. DLY position puts reverb only on wet signal. MIX position applies reverb post-mix, affecting wet and dry together.

Envelope-follower MOD MOD knob → EF- or EF+

MOD waveform becomes an envelope follower on the input signal. EF+ modulates delay time with input loudness (dynamic pitch bends); EF- inverts. RATE slider sets follower response speed.

Wow & Flutter emulation MOD knob → W&F (discrete position)

Classic tape mechanical pitch instability. RATE slider balance between wow (slow drift) and flutter (fast warble). Combined with TAPE model gives convincing vintage tape flavour.

AUX CV destinations ALT + TAP TEMPO repeatedly

Cycles AUX CV destination through 5 parameters: Drive (magenta), Noise (yellow), MOD wave (white), Fog (green), Mix (blue). One CV lane for whichever parameter you need.

Runaway feedback FB slider above 100%

Feedback goes to 160%, producing self-sustaining swells that increase in volume. Use HPF/LPF to tame frequency buildup; long-press DELAY SYNC to clear the buffer.

MOD OUT as LFO source patch MOD jack anywhere

Dedicated MOD output delivers the selected waveshape at full ±10V amplitude — ignores MOD DEPTH. Makes Sealegs a clock-syncable LFO/S&H source for the rest of the rack.

Controls

Global input DRIVE Combination input level and overdrive. CCW = muted · noon = unity · CW past noon overdrives the delay. LED shows overdrive amount.
ALT + DRIVE sets input trim (0.5×–2.5×) · DRIVE position switch moves it in the chain
Global FREEZE / ALT Tap to toggle delay freeze (loop the buffer indefinitely). Hold = ALT modifier for grey secondary parameters on other controls.
Tap = freeze · hold = ALT modifier
Global NOISE / MODE Amount of hiss/crackle noise injected into the signal. ALT-held: selects noise mode — pre-delay hiss / crackle / post-delay hiss.
Standard = level · ALT = mode · noise type varies across knob sweep
Global reverb FOG / DECAY Reverb (Fog) level. ALT + FOG knob sets reverb decay time.
Standard = level · ALT = decay
Signal chain FOG/DRIVE POSITION switch Moves Fog insertion point. IN = pre-delay · DLY = post-delay/pre-mix (wet only) · MIX = post-mix (affects wet + dry). ALT-hold moves DRIVE position instead.
3-position · stored at power-off
Global TAP TEMPO / AUX DEST Tap to set delay time when DELAY SYNC or MOD SYNC is active. ALT + tap cycles AUX CV destination (Drive, Noise, Mod, Fog, Mix).
AUX dest indicated by colour flash
Global DELAY SYNC / FB CROSS Tap = toggle delay sync to external clock or tap tempo. ALT + tap = toggle Crossed Feedback — L feedback feeds R input and vice versa.
Long-press >1s clears delay buffer
MOD section MOD SYNC / MOD PHASE Tap = sync MOD RATE to clock/tap. ALT + tap = phase-invert internal MOD on right channel only (not MOD OUT jack).
Affects oscillating waveshapes only · W&F and EF do not sync
Global output MIX Wet/dry blend. CCW = dry only · CW = wet only.
Send/Return mode (hold DELAY SYNC on boot) removes dry entirely
AUX CV AUX CV attenuverter Scales ±polarity of AUX CV. Full CW = positive unity · noon = zero · full CCW = inverted unity.
Bipolar
Delay TIME/L slider Primary (or left) delay time. Free range depends on TIME RANGE switch; sync mode offers quarter-note to 64th-note divisions.
3.125ms–6s free · clock-synced divisions up to x4/-64
Delay WIDTH/R slider Second delay time. PONG/T:W: offsets right delay 0–33% relative to left. L/R: sets right delay time independently.
Behavior depends on STEREO CONFIG switch
Delay FB slider Feedback amount — up to 160% allows runaway self-oscillation swells.
0–160% · short times = flange · long = patterns
Delay CV TIME/WIDTH/FB CV attenuverters Each attenuverts its CV input. Noon = no CV · CCW = inverted.
Per-slider bipolar
Delay TIME RANGE switch L = long (200ms–6s) · M = med (50ms–1.5s) · S = short (3.125–93.75ms). When synced, L/M/S selects whole/16th/64th note base.
3-position
Delay routing STEREO CONFIG switch PONG (top) = serial ping-pong · T:W (mid) = parallel, WIDTH offsets right · L/R (bottom) = parallel with independent L and R times.
3-position
Delay MODEL switch TAPE (top) = tape emulation · BBD (mid) = bucket-brigade · DIGI (bottom) = digital. COLOR slider degrades model-specifically.
3-position
MOD section MOD RATE slider Sets LFO rate for oscillating MOD waves, envelope-follower response rate, or wow vs flutter balance for W&F.
0.1Hz–40Hz free · synced musical divisions
MOD section MOD DEPTH slider Depth of internal MOD modulation on Delay Time. Does not affect MOD OUT jack which is always full amplitude.
0–100%
MOD section MOD knob MOD waveshape select. Standard: morphs through W&F, EF-, EF+, LFV, S&H, SQ, SINE, SAW, TRI, RAMP. ALT + turn: snaps to discrete waveform.
Continuous crossfade · ALT = stepped
Character section COLOR slider Adds model-dependent degradation. TAPE = drag/dropouts · BBD = companded noise, clock instability · DIGI = bit-crush, sample-rate reduction.
Model-dependent
Character VCF (in feedback loop) HIGHPASS FREQ slider VCF highpass cutoff. Inside the feedback loop — each repeat darkens/thins cumulatively. Outside the loop when FREEZE is active.
6dB/oct
Character VCF (in feedback loop) LOWPASS FREQ slider VCF lowpass cutoff. Combined with highpass defines the feedback bandwidth.
6dB/oct
Character CV COLOR/HPF/LPF CV attenuverters Each attenuverts its corresponding CV input.
Per-slider bipolar

I/O

IN · 13

  • IN L line/eurorack AUDIO
    Left audio input
  • IN R line/eurorack AUDIO
    Right audio input
    NORM → IN L when unpatched (mono-to-stereo)
  • FREEZE gate GATE
    Gate input — high enables delay freeze, low unfreezes
  • CLK clock/gate GATE
    Clock input for DELAY SYNC and MOD SYNC (16th-note reference)
  • AUX CV ±5V CLK
    Assignable CV input — destination selected by ALT + TAP TEMPO
  • TIME CV ±5V CV
    Delay time CV (scaled by attenuverter)
  • WIDTH CV ±5V CV
    Delay width CV
  • FB CV ±5V CV
    Feedback CV
  • MOD RATE CV ±5V CV
    MOD rate CV
  • MOD DEPTH CV ±5V CV
    MOD depth CV
  • COLOR CV ±5V CV
    COLOR amount CV
  • HPF CV ±5V CV
    Highpass cutoff CV
  • LPF CV ±5V CV
    Lowpass cutoff CV

OUT · 3

  • MOD ±10V
    Internal MOD waveform — always full amplitude regardless of MOD DEPTH slider
  • OUT L AUDIO
    Left audio output
  • OUT R AUDIO
    Right audio output