OXI Instruments: CV-Driven Patching with Coral and Meta in Eurorack Action

The video opens with a classic modular ritual: starting from scratch, Coral is set as the sole voice, and the patch is built up step by step. While Coral is often praised for its MIDI integration, here the focus is firmly on its Eurorack credentials, with the module reset and ready for hands-on CV modulation. The initial signal path is straightforward—Coral into Meta for effects, then out via the C-Leg module. Sequencing duties fall to the Metropolis, providing pitch and gate to Coral’s inputs, laying the groundwork for melodic exploration.

Once the basic sequence is running, attention shifts to engine selection within Coral, cycling through sounds until the right timbre emerges. The patch then expands with clock signals distributed via a mult, synchronising Meta, C-Leg, and modulation sources like the Wogglebug and Just Friends. This interconnected clocking ensures that envelopes, random voltages, and effects all move in rhythmic lockstep, setting the stage for a patch that’s both cohesive and primed for modulation-driven evolution.

With the core patch in place, the video pivots to the heart of modular expressiveness: CV modulation. The Coral’s filter is the first target, with Just Friends providing a set of clocked envelopes. By routing one envelope through an attenuverter (Quadrat), the depth of modulation becomes finely controllable—a nod to the importance of nuanced signal shaping in Eurorack workflows.

Experimentation continues as the modulation source is swapped for the stepped output of the Wogglebug, introducing clocked random voltages to the filter. This shift from deterministic envelopes to controlled chaos demonstrates how CV can transform a static patch into something unpredictable and organic. The creator highlights the option to use either stepped or smooth random signals, each imparting its own flavour to the evolving soundscape.

Beyond filter movement, the patch leverages modulation for amplitude and timbral variation. Just Friends is again enlisted, this time to shape the velocity and amplitude of Coral’s output. By adjusting envelope divisions and gate lengths, the dynamics of the sequence become more animated, moving away from rigid repetition.

Randomness is further explored by routing the Wogglebug’s outputs to parameters like harm, with attenuation ensuring the modulation remains musical rather than unruly. The interplay between clocked envelopes and random voltages, all tightly synced to the master clock, results in a patch that feels alive—constantly shifting, yet always under control. This section underscores the power of combining structured and stochastic modulation sources to enrich a modular performance.

The final act is all about hands-on performance. Effects modulation takes centre stage as Planar is used to record and loop manual movements, sending CV to Meta’s reverb and other parameters. By exploiting Planar’s bipolar outputs and real-time recording, the patch gains a performative edge—effects can swell, recede, or morph at the flick of a joystick, adding drama and space to the sound.

As the jam unfolds, the creator demonstrates how each modulation source—Planar, Wogglebug, Just Friends, and the Metropolis sequencer—contributes to a living, breathing patch. Live note changes, parameter tweaks on Coral, and evolving effects all combine for a session that’s both structured and spontaneous. The approach champions the idea of extracting maximum musicality from a single voice, using modulation and performance tools to unlock endless variation and expressive potential.