intellijel Quadrax Quad Function/Burst Generator/LFO with CV Matrix Eurorack Module (14 HP)

Explore modulation ecstasy with the intellijel Quadrax, a highly versatile Eurorack module with four independent, CV-controllable channels, each of which can be configured to perform a variety of modulation functions including AD envelope, AHR envelope, cycling envelope (unipolar LFO), pulse burst generator, and morphing LFO (bipolar beat-syncable). QX, an optional expansion module (sold separately) adds individual outputs for each channel's End-of-Rise and End-of-Fall triggers. The module includes a power ribbon cable.

At a Glance

The Intellijel Quadrax consists of four independent CV-controllable channels, each of which can be configured to perform any one of the following functions:

• AD (Attack, Decay) envelope
• AHR (Attack, Hold, Release) envelope
• Cycling envelope (resulting in a unipolar LFO)
• Pulse burst generator (finite repeated functions that ascend or descend in amplitude)
• Morphing, bipolar beat syncable LFO

Quadrax Overview

• The envelopes all feature a continuously variable response curve, ranging from logarithmic through linear to exponential, and a stage can be as snappy as 0.05 ms to as lengthy as 20 seconds.
• When set to Burst mode, the channel generates a rising or falling burst of pulses, with full control over the length of the pulse burst and the rate and shape of the bursts within it, along with whether the bursts increase or decrease in amplitude over the burst length.
• AD, AHR, Cycling and Burst modes have a user-selectable maximum output level of either 5V or 10V, and can be attenuated (per channel) for modulating other modules that lack attenuators.
• LFO mode offers control over the frequency and waveshape, while providing a unique morphing feature that creates numerous variations of the selected waveshape. LFOs can be either free-running or beat-synchronized using the channel's TRIG input.
• Each of the five modes (AD, AHR, Cycling, Burst, and LFO) provide both standard and alternate modes of operation, giving you even more nuanced control. Specifically, the alternate functionality for AD, AHR, and CYCLE modes changes the response curves of the envelope enabling RISE to have a logarithmic shape while FALL's shape is exponential, and vice-versa. BURST Mode's alternate function replaces the square/sine shape with a tilting sawtooth shape. The alternate LFO operation enables a chaotic voltage source, which intellijel calls a Low-Frequency Vacillator (LFV), and the knobs control the rate of vacillations along with per-cycle variance and the amount it's slewed.
• Channels can be chained together to create complex multistage envelopes, with each channel triggered by the previous channel's trigger input, end-of-rise, or end-of-fall. This enables multiple function generators to fire simultaneously, or it enables the creation of complex multistage envelopes by allowing the linked function to fire either at the end of the previous function's rise time, or at the end of its fall time.
• Four freely assignable step-attenuverted CV inputs are capable of modulating any or all of the various parameters across all four channels using the built-in CV matrix, with built-in attenuversion for each assignment.
• 1 V/oct CV inputs enable you to use LFO and Burst modes as oscillators.
• Quadrax remembers its current state (Mode and CV assignments, channel links, etc) and retains that state even if power is removed, meaning Quadrax will always turn on in exactly the same state as you last left it.

Optional QX Module

• Expand the functionality of the Quadrax with eight additional gate/trigger outputs.
• The Qx expander adds an EOR (end-of-rise) and an EOF (end-of-fall) output to each of Quadrax's four channels, enabling Quadrax's envelopes, cycles, bursts, and LFOs to trigger external modules

Eurorack Ready

• 14 HP Eurorack format module
• Maximum depth: 1.5" (38mm)
• Includes power ribbon cable with Eurorack power headers
• Power consumption: +12V: 106mA, -12V: 9mA