intellijel/quadrax

Quadrax

Intellijel

4-channel CV-controllable function generator with AD, AHR, cycling, burst, and morphing bipolar LFO modes; channels are linkable and have a fully programmable CV matrix with attenuversion.745

Capabilities 4

Burst Generatorburst-generator
Each channel can generate a burst of pulses with programmable rate, length, and pulse shape; amplitude can ascend or descend over the burst.745
Envelope Generatorenvelope-generator
Four independent channels each operable as AD or AHR envelope with continuously variable log-to-exp response curve and 0.05ms to 20s stage times.745
Function Generatorfunction-generator
Four-channel CV-controllable function generator; each channel cycles, bursts, or morphs between envelope and LFO behaviour.745
LFOlfo
Each channel can run as a free-running or beat-synchronized bipolar LFO (±5V) with morphable waveshapes, or as a chaotic Low Frequency Vacillator (LFV).745

Jacks 12 (8 in / 4 out)

NameSignalVoltageDescription
Inputs (8)
CH1 CVcv-10V to 10VFreely assignable CV input; tracks 1V/oct. Accepts up to ±10V but clips at ±5V modulation range. Can modulate Rise, Fall, Shape, or Level for any channel.745
CH1 TRIGgatePatch a trigger or gate signal here to launch the function generator. In LFO mode, functions as a clock input.745
CH2 CVcv-10V to 10VFreely assignable CV input; tracks 1V/oct. Accepts up to ±10V but clips at ±5V modulation range. Can modulate Rise, Fall, Shape, or Level for any channel.745
CH2 TRIGgatePatch a trigger or gate signal here to launch the function generator. In LFO mode, functions as a clock input.745
CH3 CVcv-10V to 10VFreely assignable CV input; tracks 1V/oct. Accepts up to ±10V but clips at ±5V modulation range. Can modulate Rise, Fall, Shape, or Level for any channel.745
CH3 TRIGgatePatch a trigger or gate signal here to launch the function generator. In LFO mode, functions as a clock input.745
CH4 CVcv-10V to 10VFreely assignable CV input; tracks 1V/oct. Accepts up to ±10V but clips at ±5V modulation range. Can modulate Rise, Fall, Shape, or Level for any channel.745
CH4 TRIGgatePatch a trigger or gate signal here to launch the function generator. In LFO mode, functions as a clock input.745
Outputs (4)
CH1 OUTcv0V to 10VOutput for the channel function generator. Unipolar 0–10V in AD/AHR/Cycle/Burst modes (configurable to 0–5V via Utility Mode), or ±5V bipolar in LFO mode.745
CH2 OUTcvOutput for the channel function generator. Unipolar 0–10V in AD/AHR/Cycle/Burst modes (configurable to 0–5V via Utility Mode), or ±5V bipolar in LFO mode.745
CH3 OUTcvOutput for the channel function generator. Unipolar 0–10V in AD/AHR/Cycle/Burst modes (configurable to 0–5V via Utility Mode), or ±5V bipolar in LFO mode.745
CH4 OUTcvOutput for the channel function generator. Unipolar 0–10V in AD/AHR/Cycle/Burst modes (configurable to 0–5V via Utility Mode), or ±5V bipolar in LFO mode.745

Parameters 20

NameTypeRangeBehavior
Ch1 Fallknob0.05ms – 20000msIn AD/AHR/CYCLE modes: fall/release time from ~0.05ms to ~20s. In BURST mode: sets burst length from ~0.3ms to ~20s. In standard LFO mode: MORPH knob for waveshape variations. In alternate LFO mode: VARIANCE knob for vacillation extent.745
Ch1 LinkbuttonPrimary: determines whether and how the prior channel triggers this channel (No Link / Trigger Link / End-of-Rise Link / End-of-Fall Link). Secondary (long-press): enter CV Assignment mode to assign CV inputs to destinations.745
Ch1 ModebuttonCycles through AD/AHR/CYCLE/BURST/LFO modes. Long-press (>1s) toggles STANDARD/ALTERNATE operation. In CV Assignment mode, sets modulation destination and attenuversion amount.745
Ch1 Riseknob0.05ms – 20000msIn AD/AHR/CYCLE modes: controls rise (attack) time from ~0.05ms (fully CCW) to ~20s (fully CW). In BURST mode: sets pulse rate from 0.05Hz to ~3.33kHz. In LFO mode: sets rate or clock multiply/divide (1/64 to 64x at noon=1x).745
Ch1 ShapeknobIn AD/AHR/CYCLE: noon=linear, CW=exponential, CCW=logarithmic (standard); in alternate, CW=exponential attack+logarithmic decay (spikey), CCW=logarithmic attack+exponential decay (bell). In BURST: shapes burst envelope and pulse waveform. In LFO: selects LFO waveshape (modified by MORPH/FALL). In LFV: slews vacillation peaks.745
Ch2 FallknobIn AD/AHR/CYCLE modes: fall/release time from ~0.05ms to ~20s. In BURST mode: sets burst length from ~0.3ms to ~20s. In standard LFO mode: MORPH knob for waveshape variations. In alternate LFO mode: VARIANCE knob for vacillation extent.745
Ch2 LinkbuttonPrimary: determines whether and how the prior channel triggers this channel (No Link / Trigger Link / End-of-Rise Link / End-of-Fall Link). Secondary (long-press): enter CV Assignment mode to assign CV inputs to destinations.745
Ch2 ModebuttonCycles through AD/AHR/CYCLE/BURST/LFO modes. Long-press (>1s) toggles STANDARD/ALTERNATE operation. In CV Assignment mode, sets modulation destination and attenuversion amount.745
Ch2 RiseknobIn AD/AHR/CYCLE modes: controls rise (attack) time from ~0.05ms (fully CCW) to ~20s (fully CW). In BURST mode: sets pulse rate from 0.05Hz to ~3.33kHz. In LFO mode: sets rate or clock multiply/divide (1/64 to 64x at noon=1x).745
Ch2 ShapeknobIn AD/AHR/CYCLE: noon=linear, CW=exponential, CCW=logarithmic (standard); in alternate, CW=exponential attack+logarithmic decay (spikey), CCW=logarithmic attack+exponential decay (bell). In BURST: shapes burst envelope and pulse waveform. In LFO: selects LFO waveshape (modified by MORPH/FALL). In LFV: slews vacillation peaks.745
Ch3 FallknobIn AD/AHR/CYCLE modes: fall/release time from ~0.05ms to ~20s. In BURST mode: sets burst length from ~0.3ms to ~20s. In standard LFO mode: MORPH knob for waveshape variations. In alternate LFO mode: VARIANCE knob for vacillation extent.745
Ch3 LinkbuttonPrimary: determines whether and how the prior channel triggers this channel (No Link / Trigger Link / End-of-Rise Link / End-of-Fall Link). Secondary (long-press): enter CV Assignment mode to assign CV inputs to destinations.745
Ch3 ModebuttonCycles through AD/AHR/CYCLE/BURST/LFO modes. Long-press (>1s) toggles STANDARD/ALTERNATE operation. In CV Assignment mode, sets modulation destination and attenuversion amount.745
Ch3 RiseknobIn AD/AHR/CYCLE modes: controls rise (attack) time from ~0.05ms (fully CCW) to ~20s (fully CW). In BURST mode: sets pulse rate from 0.05Hz to ~3.33kHz. In LFO mode: sets rate or clock multiply/divide (1/64 to 64x at noon=1x).745
Ch3 ShapeknobIn AD/AHR/CYCLE: noon=linear, CW=exponential, CCW=logarithmic (standard); in alternate, CW=exponential attack+logarithmic decay (spikey), CCW=logarithmic attack+exponential decay (bell). In BURST: shapes burst envelope and pulse waveform. In LFO: selects LFO waveshape (modified by MORPH/FALL). In LFV: slews vacillation peaks.745
Ch4 FallknobIn AD/AHR/CYCLE modes: fall/release time from ~0.05ms to ~20s. In BURST mode: sets burst length from ~0.3ms to ~20s. In standard LFO mode: MORPH knob for waveshape variations. In alternate LFO mode: VARIANCE knob for vacillation extent.745
Ch4 LinkbuttonPrimary: determines whether and how the prior channel triggers this channel (No Link / Trigger Link / End-of-Rise Link / End-of-Fall Link). Secondary (long-press): enter CV Assignment mode to assign CV inputs to destinations.745
Ch4 ModebuttonCycles through AD/AHR/CYCLE/BURST/LFO modes. Long-press (>1s) toggles STANDARD/ALTERNATE operation. In CV Assignment mode, sets modulation destination and attenuversion amount.745
Ch4 RiseknobIn AD/AHR/CYCLE modes: controls rise (attack) time from ~0.05ms (fully CCW) to ~20s (fully CW). In BURST mode: sets pulse rate from 0.05Hz to ~3.33kHz. In LFO mode: sets rate or clock multiply/divide (1/64 to 64x at noon=1x).745
Ch4 ShapeknobIn AD/AHR/CYCLE: noon=linear, CW=exponential, CCW=logarithmic (standard); in alternate, CW=exponential attack+logarithmic decay (spikey), CCW=logarithmic attack+exponential decay (bell). In BURST: shapes burst envelope and pulse waveform. In LFO: selects LFO waveshape (modified by MORPH/FALL). In LFV: slews vacillation peaks.745

Firmware history 9 versions

VersionReleasedNotes
1.42023-04Added CVD Mode (alternative button coloring for color vision deficiency). In Utility Mode, sync LEDs now flash with a trigger.745
1.32021-09Added Utility Mode for manually triggering each channel and setting per-channel output voltages (5V or 10V, with 20% attenuation steps). Moved 10V/5V setting from System Mode to per-channel Utility Mode. Fixed Phase/Clock Sync abnormalities in LFV Mode.745
1.2.12021-03-09Reduced pot dead zone. Fixed slightly longer minimum attack/decay times. Fixed LFOs not clock syncing in some cases. Fixed channel link to be a gate (not trigger) for proper AHR linking.745
1.2.02020-11-19LFOs now phase-locked to TRIG input; linked LFOs phase-lock to first LFO's TRIG; reset via trigger on any chained LFO TRIG. Snappier envelopes (virtually zero attack/decay). Removed crossfade at extreme ends of standard burst mode. Added 5% pot dead zone. Various fixes: trigger detection, LFO lockup, cycle mode stuck at minimum, one-shot waveform and retrigger bugs.745
1.1.32020-03-03Fixed settings not carrying over correctly when upgrading from firmware 1.0.2 or earlier.745
1.1.22020-02-25Added long-press LEVEL button in System Mode to reset module to default settings. Fixed edge case where CV assignments were not being applied.745
1.12020-02-06Completely redesigned Burst Mode: RISE sets pulse rate, FALL sets burst length, SHAPE morphs pulse shape (square to sine in standard; saw to triangle to ramp in alternate). Added Alternate modes for all 5 channel modes. Added System Mode for global settings. More extreme log/expo curves. Fixed distorted expo/log curves.745
1.0.22019-12-19Fixed dithering algorithm to remove quantize error noise on certain low frequency signals. Hold SHAPE on boot to toggle dithering.745
1.0.12019-11Initial Release745

References 2

  1. [745]
    Quadrax Manual v1.4manual
    verified 2026-05-22
  2. [746]
    Intellijel Quadrax product pageproduct_page
    verified 2026-05-22