OXI Coral Now Has 27 Synth Engines. Your Module Can Only Hold 10 at Once.

What changed in Coral 3.0?

OXI Instruments just pushed the third major firmware update for Coral, its 8-voice polyphonic synth voice for Eurorack, and the headline move is not really the six new engines. It is who gets to decide which ones your module actually runs.

The update adds FMX7 (a six-voice, six-operator FM engine that loads classic DX7 patches straight off an SD card), OB-va (an Oberheim-flavored engine with unison, detune and selectable filter poles), String 2 (Solina-style strings with chord mode), Pianoz (house pianos, Rhodes and organ patches), Acid2 (OXI's refreshed take on the Roland TB-303) and Stitcher (an experimental drone generator). That brings Coral's total engine library to 27, per OXI Instruments' own changelog, confirmed by Synth Anatomy and MatrixSynth.

Why does the 10-slot limit matter?

Here is the catch, and it is the actual story. Coral's hardware can only hold 10 engine slots in memory at once. Instead of shipping a fixed factory selection, as every synth voice before it has, OXI built a browser-based Firmware Updater that lets owners pick their own 10 engines from the full library of 27, compile the build in the browser, and flash it to the module in a few clicks. No code, no command line.

That flips the usual hardware relationship. A normal Eurorack voice gives you whatever the factory baked in; Coral turns the choice over to the player, within a hard cap the hardware physically enforces. Want a module that only does acid lines and FM bells? Build that. Want the full orchestral and vintage spread instead? Build that. You just cannot have all 27 at once, and some engine combinations eat the memory budget faster than others.

"Pick the engines you need, compile your own custom firmware right in the browser, and upload it to Coral in a few clicks."

What else is new?

Coral 3.0 also adds a drone mode that sustains any loaded engine and shapes it through a low-pass gate, useful for the kind of long evolving textures that got their own dedicated engine this round (Stitcher). OXI also moved option settings on-module, replacing the old workflow of editing a text file by hand to change a setting. Coral remains an 8-voice polyphonic Eurorack synth voice priced at $399 / 389 euro, and the firmware update itself is free for anyone who already owns the module.