Eurorack Reference

Intellijel / intellijel/sealegs

Sealegs

Stereo character delay with reverb modeling three delay circuit types: tape, bucket brigade, and digital. Features per-model color controls, built-in modulator with 7 morphing waveshapes plus Wow & Flutter and envelope follower, highpass and lowpass filters in the feedback loop, built-in hiss and crackle noise, freeze functionality, and a spacious reverb with configurable insert position. [14]

Specifications

HP
20
Depth
29 mm
+12V
116 mA
−12V
10 mA
+5V
—
Last verified
2026-05-02

Capabilities

  • Clock Sync clock-sync
  • Envelope Follower envelope-follower
  • Freeze freeze
    Freeze via button or gate input. TAPE and BBD modes use analog-style freeze (cutting input, locking feedback at 100%). DIGI mode freezes buffer indefinitely without modification by modulation or time changes. When frozen, filters move outside feedback loop. [14]
  • LFO lfo
    Built-in modulator with 7 morphing waveshapes (LFV, S&H, Square, Sine, Saw, Ramp, Triangle), Wow & Flutter emulation, and positive/negative envelope followers. Rate 0.1–40Hz free-running. Output available at MOD OUT jack at full amplitude. [14]
  • Reverb reverb
    Lush 1970s-inspired reverb with 3 configurable insert positions (pre-delay, post-delay, post-mix) and adjustable decay time. [14]
  • Stereo Delay stereo-delay
    Models tape, bucket brigade, and digital delay circuits. Supports PONG (series), T:W (parallel with offset), and L/R (fully independent) stereo configurations. Up to 6s (L) and 8s (R) delay time. [14]
  • Vcf vcf
    Dedicated highpass and lowpass filters (6dB/oct each) inside the feedback loop. Both have CV inputs with attenuverters. Filters move outside feedback loop when Freeze is active. [14]

Jacks (16)

Inputs (13)

NameSignalVoltageDescription
AUX CV IN cv — Control voltage input with assignable destination (DRIVE, NOISE, MOD waveform, FOG, or MIX) and dedicated attenuverter. [14]
CLK IN clock — Clock source for delay time and/or mod rate sync when DELAY SYNC or MOD SYNC buttons are lit. [14]
COLOR CV In cv — [14]
FB CV IN cv — [14]
FREEZE IN gate — High gate enables freeze; low gate unfreezes. [14]
HIGHPASS FREQ CV In cv — [14]
IN L audio — Left channel audio input. Use as mono input when processing a mono signal, leaving IN R unpatched. [14]
IN R audio — Right channel audio input. Normalled to IN L when unpatched. [14]
LOWPASS FREQ CV In cv — [14]
MOD DEPTH CV IN cv — [14]
MOD RATE CV IN cv — [14]
TIME/L CV IN cv — CV input for modulating delay time. Positive voltages increase delay time; negative voltages decrease it. [14]
WIDTH/R CV IN cv — [14]

Outputs (3)

NameSignalVoltageDescription
MOD OUT cv — CV output of the MOD WAVE at full amplitude, unaffected by the MOD DEPTH slider. Can be used to modulate external modules or other Sealegs parameters via self-patching. [14]
OUT L audio — [14]
OUT R audio — [14]

Parameters (29)

NameTypeRangeMin FWBehavior
AUX CV attenuverter knob — — Scales amount and polarity of AUX CV IN signal. Fully CW = full range. Noon = fully attenuated. Fully CCW = full inverted range. [14]
COLOR fader — — Adds model-specific sonic artifacts. TAPE: tape drag, degradation & dropouts. BBD: grit via companded noise and clock instability. DIGI: bit-crushing and sample rate reduction. [14]
COLOR CV attenuverter knob — — [14]
DELAY SYNC / FB CROSS button — — Standard: toggles delay sync on/off (lit orange when on). ALT (holding ALT button): toggles crossed feedback on/off (lit blue when on). Long-press (>1 second) clears the delay buffer. [14]
DRIVE knob — — Standard: combination input level and overdrive control. Fully CCW = fully attenuated input. Noon = unity gain. CW from noon = additional gain or overdrive beyond 5V. ALT (holding ALT button): input trim control. Noon = 1x trim; fully CCW = half; fully CW = 2.5x boost. [14]
FB fader ≤160% — [14]
FB CV attenuverter knob — — [14]
FOG knob — — Standard: controls level of built-in reverb. ALT (holding ALT button): varies fog decay time. [14]
FOG/DRIVE POSITION switch — 1.1+ Standard: selects FOG insert position: IN (after drive, before delay), DLY (after delay, before MIX), or MIX (post-MIX, affects wet and dry). ALT (holding ALT button): selects DRIVE insert position with same three options. [14]
FREEZE / ALT button — — Tap to toggle freeze on/off (lit cyan when frozen, buffer loops continuously). Hold to access ALT functions on other controls. [14]
HIGHPASS FREQ fader — — Sets highpass filter cutoff frequency in the feedback loop (or applied to frozen signal output when frozen). Attenuates below cutoff at 6dB/oct. Higher slider position removes more low frequencies. [14]
HIGHPASS FREQ CV attenuverter knob — — [14]
LOWPASS FREQ fader — — Sets lowpass filter cutoff frequency in the feedback loop (or applied to frozen signal output when frozen). Attenuates above cutoff at 6dB/oct. Lower slider position removes more high frequencies. [14]
LOWPASS FREQ CV attenuverter knob — — [14]
MIX knob — — Sets wet/dry mix. Fully CCW = dry only. Fully CW = wet only. In between = blend of dry and wet. [14]
MOD knob — — Selects MOD waveform. Standard: sweeps through W&F, EF-, EF+ (discrete), LFV1, S&H, Square, Sine, Saw, Ramp (with morphing between continuous waveforms). ALT (holding ALT button): jumps directly to demarcated waveform without morphing. [14]
MOD DEPTH fader — — Controls depth of internal delay time modulation. Does not affect amplitude of signal at MOD OUT jack. [14]
MOD DEPTH CV attenuverter knob — — [14]
MOD RATE fader 0.1Hz – 40Hz — Sets modulation rate for selected MOD waveform. For oscillating waveshapes: sets oscillation rate. For envelope followers: sets response rate. For Wow & Flutter: crossfades between wow (low) and flutter (high). Can be synced to clock or tap tempo. [14]
MOD SYNC / MOD PHASE button — — Standard: toggles mod rate sync on/off (lit orange when on; only affects oscillating waveshapes, not Wow & Flutter or envelope followers). ALT (holding ALT button): toggles phase inversion of internal MOD WAVE for the right channel (lit blue when on). [14]
MODEL switch — — Three-position switch selecting delay circuit emulation: TAPE (tape-based characteristics), BBD (bucket brigade characteristics), DIGI (digital delay characteristics). Each model has unique COLOR behavior. [14]
NOISE knob — — Standard: varies amount of noise injected into the signal path. ALT: changes noise mode — fully CCW is pre-delay hiss; clockwise introduces crackle (full at noon); past noon introduces post-delay hiss. [14]
STEREO CONFIG switch — — Three-position switch. PONG: L+R summed to mono, delays in series. T:W: parallel delays with WIDTH/R adding 0–33% offset to primary time. L/R: parallel delays with fully independent left and right delay times. [14]
TAP TEMPO / AUX DEST button — — Standard: tap repeatedly to set tempo for delay time and mod rate sync. ALT (holding ALT button): cycles through AUX CV destination options (DRIVE, NOISE, MOD waveform, FOG, MIX). [14]
TIME CV attenuverter knob — — [14]
TIME RANGE switch — — Three-position switch. Un-synced: SHORT = 3.125ms–93.75ms, MED = 50ms–1.5s, LONG = 200ms–6s. Synced: SHORT = 64th–16th note, MED = 16th–quarter note, LONG = quarter–whole note (based on 16th note clock). [14]
TIME/L fader — — Sets left channel delay time (or primary delay time in PONG/T:W modes). Range depends on TIME RANGE switch: SHORT = 3.125ms–93.75ms, MED = 50ms–1.5s, LONG = 200ms–6s (free-running). Can be synced to clock or tap tempo. [14]
WIDTH CV attenuverter knob — — [14]
WIDTH/R fader — — In PONG/T:W modes: adds 0%–33% offset to primary delay time. In L/R mode: sets right channel delay time directly (same range as TIME/L, governed by TIME RANGE switch). [14]

Firmware history (4 versions)

VersionReleasedNotes
1.3 2025-11-24 Tweaks: Hiss is now stereo and a bit more chill; Crackle is less dense. New: Drive stage is brighter sounding by default. New: Original darker drive available by holding SYNC-MOD on boot. [14]
1.2 2024-05-13 Gain staging updates: reduced attenuation on signals, MIX control more balanced, output louder. Adjusted Drive processor gain staging in all 3 Drive Positions. Raised threshold on output limiter, reduced pre-attenuation. Wider detent for 1x input trim. New: Send/Return Mode (hold DELAY SYNC on boot) — DRY not passed through, MIX controls WET level only. [14]
1.1 2023-11-22 New: DRIVE position switch — DRIVE circuit can now be moved to IN, DLY, or MIX positions in signal chain (hold ALT while toggling FOG/DRIVE POSITION switch). Setting saved across boots. Tweak: FREEZE is now clickless on all modes. [14]
1.0 2023-08 Initial release [14]

References (2)