Eurorack Reference

Intellijel / intellijel/swells

Swells

Multi-model stereo reverb with 9 reverb models and built-in SWELL Generator envelope follower. [16]

Specifications

HP
20
Depth
30 mm
+12V
117 mA
−12V
6 mA
+5V
—
Last verified
2026-05-02

Capabilities

  • Envelope Follower envelope-follower
    SWELL Generator normalled to all reverb parameters; four operating modes; CV output 0-5V; can be triggered from IN, SC, or OUT signal [16]
  • Stereo Reverb stereo-reverb
    Nine selectable reverb models (Fog, Blur, Shadow, Velvet, Asterion, Deadspace, Buckets, Ritual, Gaze) with EBB and FLOW model-specific controls, LO-FI modifier, and comprehensive slider controls [16]

Jacks (9)

Inputs (6)

NameSignalVoltageDescription
IN L audio — Left audio input; left normals to right [16]
IN R audio — Right audio input; left normals to right [16]
LEVEL cv -10V to 10V CV input for INPUT and MIX controls [16]
Mod Inputs 1-8 cv -10V to 10V Parameter modulation inputs; attenuverters control modulation amount and polarity [16]
SC mixed -10V to 10V Sidechain audio or CV input for SWELL generator [16]
TRIG trigger ≥1.2V Assignable trigger input, threshold >1.2V [16]

Outputs (3)

NameSignalVoltageDescription
OUT L audio — [16]
OUT R audio — [16]
SWELL cv 0V to 5V SWELL envelope output [16]

Parameters (40)

NameTypeRangeMin FWBehavior
ALT button — — Accesses ALT functions labelled in grey: TRIM, HPF→VERB, TRIG Assign, DRIVE, EF GAIN, MODE, LPF→EF, TYPE [16]
BURST button — — [16]
CV Attn 1-8 knob — — Attenuverters for Mod Inputs 1-8 and SWELL normalling; control modulation amount and polarity [16]
DECAY fader — — Controls decay/feedback of the reverb [16]
DRIVE menu_setting — — ALT function: toggles DRIVE saturation for the INPUT signal [16]
EBB fader — — Model-specific parameter 1; function changes based on the MODEL and LO-FI switches [16]
EF GAIN menu_setting — — ALT function: sets the gain of the trigger source for the SWELL envelope follower [16]
EQ fader — — High/Low tilt EQ for the reverb signal [16]
FALL knob — — Controls fall/release time of the SWELL Generator [16]
FLOW menu_setting — — Model-specific parameter 2; function changes based on the MODEL and LO-FI switches [16]
FREEZE button — — [16]
HPF→VERB menu_setting — — ALT function: sets highpass filter cutoff on the input to the reverb [16]
Hi-DAMP fader — — High-frequency damping for the reverb signal [16]
IN/SC/OUT switch — — Selects the trigger/follower source for the SWELL generator: input, sidechain, or output [16]
INPUT knob — — Sets the level of IN L / IN R signal fed to the reverb [16]
LEVEL Attn (INPUT) knob — — CV attenuverter routing LEVEL CV input to the INPUT control [16]
LEVEL Attn (MIX) knob — — CV attenuverter routing LEVEL CV input to the MIX control [16]
LO-FI switch — — Three-position switch (OFF, MIN, MAX) applying model-specific degrading or modifying effects to the reverb audio [16]
LPF→EF menu_setting — — ALT function: sets lowpass filter cutoff on the SWELL envelope follower source [16]
MIX knob — — Controls the dry/wet mix of the reverb signal [16]
MODE menu_setting — — ALT function: selects the trigger mode of SWELL (Follow, Gated, One Shot, Delayed One Shot, Looping) [16]
MODEL 1/2/3 switch — — Selects the reverb model within the active bank (1, 2, or 3); combined with MODEL X/Y/Z switch to select from 9 models [16]
MODEL X/Y/Z switch — — Selects the reverb bank (X, Y, or Z) [16]
MODEL sub-mode Z-3 (Gaze) menu_setting — — Gaze: Inspired by classic nonlinear algorithms [16]
PREDELAY fader — — [16]
REVERSE button — — [16]
RISE knob — — Controls rise/attack time of the SWELL Generator [16]
SIZE fader — — [16]
SWELL button button — — Manual trigger for the SWELL envelope generator [16]
THRESH knob — — Threshold setting for triggering the SWELL envelope [16]
TRIM menu_setting — — ALT function: adjusts the gain of the input signal [16]
TYPE menu_setting — — ALT function: selects the BURST effect type [16]
X-1 (Fog) menu_setting — — Fog: Sealegs' classic lush reverb. EBB: Diffusion Sparse→Smeared. FLOW: Modulation ± (Sine up / Random down). LO-FI MIN: Tape Wow / Subtle Saturation. LO-FI MAX: Tape Wow/Flutter / Deep Saturation. [16]
X-2 (Blur) menu_setting — — Blur: mutant offspring of Multigrain's built-in reverb. EBB: Diffusion Sparse→Smeared. FLOW: Modulation ± (Sine up / Random down). LO-FI MIN: Tape Wow / Subtle Saturation. LO-FI MAX: Tape Wow/Flutter / Deep Saturation. [16]
X-3 (Shadow) menu_setting — — Shadow: Classic Dark Hall, long corridors, huge spaces. EBB: Diffusion Sparse→Smeared. FLOW: Modulation ± (Sine up / Random down). LO-FI MIN: Tape Wow / Subtle Saturation. LO-FI MAX: Tape Wow/Flutter / Deep Saturation. [16]
Y-1 (Velvet) menu_setting — — Velvet: High echo density, fast attack, no metallic ringing, modern and bright. EBB: Diffusion Sparse→Smeared. FLOW: Modulation ± (Sine up / Random down). LO-FI MIN: Jel Compression (Fast Att/Slow Rel, 4:1/Medium Thresh). LO-FI MAX: Squash Compression (Slow Att/Slow Rel, 8:1/Low Thresh). [16]
Y-2 (Asterion) menu_setting — — Asterion: Metastable multitap delay inspired by celestial vintage hardware. EBB: Diffusion Sparse→Smeared. FLOW: Modulation ± (Sine up / Random down). LO-FI MIN: Jel Compression. LO-FI MAX: Squash Compression. [16]
Y-3 (Deadspace) menu_setting — — Deadspace: Non-Newtonian smearing. EBB: Filter Resonance Off→Max. FLOW: Force ± (Push up / Pull down). LO-FI MIN: Jel Compression. LO-FI MAX: Squash Compression. [16]
Z-1 (Buckets) menu_setting — — Buckets: Matrix of variable sample-rate delays with cruft and crunch. EBB: Mod Rate Slow→Fast. FLOW: Mod Depth ± (Sine up / Random down). LO-FI OFF: BBD Clock Rate 1/1. LO-FI MIN: BBD Clock Rate 2/3. LO-FI MAX: BBD Clock Rate 1/2. [16]
Z-2 (Ritual) menu_setting — — Ritual: Harmonious reverb with octaves, fifths, and spiralling dissonance. EBB: Pitch/Freq Shift ± (Shift Up / Shift Down). FLOW: Shifted Feedback Off→Max. LO-FI OFF: Quantized Pitch ± 2nd/4th/5th/Oct. LO-FI MIN: Free Pitch ± 1 Oct. LO-FI MAX: Freq Shifting ± 100Hz. [16]

Firmware history (2 versions)

VersionReleasedNotes
1.1 — [16]
1.0 — [16]

References (2)