CTXMatrix is completely free and now available only on request, making it easier for me to manage distribution and provide ongoing support. Each version is valid until January of the following year (the current one runs through January 2027), and I'll send you the newer, improved version before it expires—free, of course. If you'd like a copy, just email me, and I'll send the standard CTXMatrix Lite plugin along with any guidance you need. If you prefer a permanent plugin without expiry, please let me know. To those having personalized plugins with your name in the UI, please disregard that and use this version. The previous versions had an error with refresh rate affecting the performance.
If you're seeking support, please read the setup and installation guide in the Readme before reaching out—this often resolves most issues. When you do contact me, please include the following details to help me assist you better: your speaker angle, reference to the Readme by providing the A and B distances for double confirmation, your host and OS for troubleshooting, and—I would also appreciate it—the tracks where you've noticed specific issues with sound quality.
Go to my Blog for updates.
Important note: The download links are sent directly from Microsoft (via OneDrive) to the email address that's linked to my OneDrive account. If you're using a disposable or secondary email to stay anonymous, the email might end up in your spam/junk folder or other tabs (like Promotions or Updates), so please check those carefully.
Get Immersive 180° 3D Audio from Regular Stereo Setup
Transform any conventional stereo loudspeaker setup into a convincing 180° three-dimensional soundstage with CTXMatrix, a free 64-bit VST3 plugin that implements an enhanced version of Ralph Glasgal’s RACE (Recursive Ambiophonic Crosstalk Elimination) algorithm.
Key Features
Full 180° soundstage using speakers placed at ±20° to 65°. Five-stage calibration interface for precise delay and attenuation adjustment. Stable, externalised 3D imaging with real-time crosstalk cancellation. Completely free for personal and non-commercial use (full license details provided with the plugin).
Critical Calibration Advice
Successful results depend on carefully following the five-stage procedure outlined in the comprehensive Readme. Most important: When performing the occlusion test to locate the exact phantom image, the test signal must be played at a very low listening level (barely audible, close to your normal threshold of hearing). If the signal is too loud, there won't be enough subtle cues to detect the precise shifts. Play softly during calibration, then enjoy music at any volume afterward.
For in-depth preparation, speaker setup recommendations, the full step-by-step calibration process (including the single-ear occlusion test), usage tips, and a table of approximate baseline settings for different speaker angles, please see the complete Readme here: https://ambiophonics.wordpress.com/2025/10/01/readme-for-ctxmatrix/
Technical Notes
Delay values are expressed in samples; displayed figures are approximate and for reference only. The plugin is statically linked with all necessary components and works on most modern Windows installations without external dependencies. If you encounter loading issues, installing the latest Microsoft Visual C++ Redistributable usually resolves them.
Support and Feedback
Feel free to reach out anytime at by emailing for the plugin, questions, or suggestions.