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Matriq-Six: A Free Oberheim Matrix-6R Emulation
Full Bucket's free Matriq-Six emulates the 1985 Oberheim Matrix-6R at the CPU level. What it models, formats, its prototype status, and how it compares to Arturia.
M
Marcus Feld
November 3, 2026 · 7 min read
Full Bucket Music released Matriq-Six on October 26, 2026, a free software instrument that recreates the 1985 Oberheim Matrix-6R. It is an unusual emulation: rather than approximate the sound with modern DSP, it models the original 6809 processor and hardware, running the real ROM v2.15 code by Bob Grieb. The developer is upfront that this is an early prototype, so treat it as a first look at a promising free plugin rather than a finished release. All details below come from Full Bucket's official product page.
At a glance: Matriq-Six is a free emulation of the Oberheim Matrix-6R, in VST2, VST3, CLAP and AAX on Windows and those plus AU on macOS. It is 6-voice polyphonic, written in native C++, has a resizable interface and loads SysEx patch files. The current build is version 0.5.5, described by its author as a prototype for hardcore fans.
What is the Oberheim Matrix-6R?
To understand Matriq-Six, you need to know the hardware it recreates. The Oberheim Matrix-6 arrived in 1985 as an affordable analog polysynth, and the Matrix-6R is its rackmount, keyboard-free sibling. Both are six-voice instruments built around Curtis CEM3396 chips, with two digitally controlled oscillators per voice feeding a single analog filter.
The instrument's name comes from its signature feature: the Matrix modulation system. Instead of a few fixed routings, it let you patch a wide set of modulation sources to a wide set of destinations through software, which was unusually flexible for its price and era. The catch was the interface. The Matrix-6R has almost no physical controls, so every parameter is edited through a tiny display and a membrane keypad. That made the hardware powerful but famously tedious to program, which is exactly the kind of quirk a faithful emulation inherits and a modern plugin UI can relieve.
The Matrix-6R has a warm, slightly soft analog character, prized for pads, strings and organ-like tones. It is the affordable gateway to the Oberheim Matrix sound, below the far rarer Matrix-12.
How Matriq-Six emulates it
Most vintage synth plugins model the sound. Matriq-Six models the machine. Full Bucket Music built it around a simulation of the original 6809 CPU and the surrounding hardware, and it runs ROM v2.15 by Bob Grieb, a well-known restoration of the Matrix firmware. In practice that means the plugin reproduces the instrument's actual behavior: the same modulation math, the same parameter ranges, the same patch structure, because it is running something very close to the original code.
This is the same approach Full Bucket has taken with other emulations, and it is why the project loads Matrix-6R SysEx files directly. If you have patches from a real unit or from online patch libraries, you can bring them straight into the plugin. The flip side of CPU-level accuracy is that it also inherits the hardware's limits, and in a prototype some of those are still rough. The author notes the filters do not yet sound as good as they should, and that tape import and export may not work. These are the honest edges of a 0.5.5 build.
Matriq-Six specifications
| Spec | Detail |
|---|---|
| Developer | Full Bucket Music (Björn Arlt) |
| Type | Emulation of the Oberheim Matrix-6R (1985) |
| Modeling | 6809 CPU and hardware simulation, ROM v2.15 by Bob Grieb |
| Polyphony | 6 voices |
| Patch loading | Imports Matrix-6R SysEx files |
| Interface | Resizable, native C++ |
| Formats (Windows) | VST2, VST3, CLAP, AAX (32- and 64-bit) |
| Formats (macOS) | VST2, VST3, CLAP, AU, AAX |
| Version | 0.5.5 (October 26, 2026), prototype |
| Price | Free |
Matriq-Six vs Arturia Matrix-12 V
The obvious paid comparison is Arturia's Oberheim emulation. Arturia models the larger, more expensive Matrix-12 rather than the 6R, so this is not a like-for-like contest, but it is the choice a lot of producers will weigh: a free, authentic 6R prototype against a polished commercial plugin.
| Matriq-Six | Arturia Matrix-12 V | |
|---|---|---|
| Models | Oberheim Matrix-6R (1985) | Oberheim Matrix-12 |
| Approach | CPU-level hardware emulation | DSP emulation with extras |
| Voices | 6 | 12 |
| Interface | Faithful, prototype | Modern, polished |
| Presets | Load via SysEx | Large factory library |
| Support and updates | Hobby project, prototype | Commercial, maintained |
| Price | Free | $149 |
If you want the exact Matrix-6R behavior, free, and you enjoy vintage authenticity with its quirks, Matriq-Six is remarkable for existing at all. If you want a bigger, more polished Oberheim sound with a deep preset library, a modern interface and ongoing support, the paid Arturia Matrix-12 V is the safer studio tool. For broader free options, Full Bucket's own FB-3300 and open synths like Surge XT and Vital cover different ground.
Who Matriq-Six is for
Matriq-Six suits vintage-synth enthusiasts, Oberheim fans and anyone curious about CPU-accurate emulation. If you have owned or lusted after a Matrix-6R, this gives you its real behavior for nothing, with the bonus of a modern, resizable editor over the hardware's painful menu system. It is also a natural fit for producers who already collect SysEx patch banks and want to play them without a real unit on the desk.
It is not the right pick if you need a dependable, finished instrument today. This is a 0.5.5 prototype, the filters are still being refined, and some import features may not work. Anyone who wants a polished Oberheim sound for serious sessions should look at a maintained commercial plugin instead, at least until Matriq-Six matures. Treat it as an exciting work in progress worth watching.
How much does Matriq-Six cost?
Matriq-Six is free. Full Bucket Music has a long history of giving away faithful vintage emulations, and this follows that pattern. You can download it from the official Full Bucket Music Matriq-Six page, which also hosts the developer's notes on the current build.
If you would rather buy a finished, supported Oberheim-style instrument, the commercial option is Arturia's take on the larger Matrix-12.
Check price on Plugin BoutiqueFor more no-cost instruments, see our roundup of the best free synth VSTs of 2026.
FAQ
Is Matriq-Six really free?
Yes. Matriq-Six is a free download from Full Bucket Music, in keeping with the developer's catalog of free vintage synth emulations.
What hardware does Matriq-Six emulate?
It emulates the Oberheim Matrix-6R from 1985, the rackmount version of the Matrix-6. It does so by simulating the original 6809 CPU and running ROM v2.15 by Bob Grieb.
What formats and systems does Matriq-Six support?
On Windows it installs as VST2, VST3, CLAP and AAX. On macOS it adds AU to that list. Both 32- and 64-bit builds are offered.
Can I load real Matrix-6R patches?
Yes. Matriq-Six imports Matrix-6R SysEx files, so patches from a real unit or from online libraries can be loaded directly.
Is Matriq-Six finished?
No. The current build is version 0.5.5, which the developer describes as a prototype for hardcore fans. The filters are still being improved and some import features may not work yet.
Verdict
Matriq-Six is one of the most interesting free releases of the moment, even in prototype form. Emulating the Oberheim Matrix-6R at the CPU level, with the real ROM and SysEx patch loading, is a purist's approach that rewards anyone who loves the instrument, and getting it for free with a modern editor over that notorious menu system is a genuine gift. Keep the limits in view: this is a 0.5.5 build, the filters need work, and it is not meant to be a finished studio tool yet. For enthusiasts and the curious, it is an easy free download to try today. For dependable sessions, a maintained commercial Oberheim plugin is still the safer choice. Either way, keep an eye on this one. For more, start with our best free synth VSTs of 2026.
