Excellent tool, thank you! I'll be giving this a shot shortly, as I already use Equalizer APO to do the upmixing, just I toggle it manually via hotkey atm.Just made a little writeup. There's a download button with a zip with the VST plugin .dll in, which is all you need.
Adaptive Stereo to 5.1 Surround Upmixer. Contribute to itsalic/StereoToSurroundUpmixer development by creating an account on GitHub.github.com