OCELOT Upmixer from Fuse Audio Labs
OCELOT Upmixer uses spectral diffusion to emulate a stereo image, and is said to offer results that are free from artefacts while maintaining mono compatibility.

https://www.soundonsound.com/

OCELOT Upmixer uses spectral diffusion to emulate a stereo image, and is said to offer results that are free from artefacts while maintaining mono compatibility.
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