Ironically Amir is vehemently anti-upmixing. See this thread https://www.audiosciencereview.com/forum/index.php?threads/what-do-listeners-prefer-for-small-room-acoustics.286/page-7#post-9703
But he went completely mute when he hero Toole made clear he does just that https://www.audiosciencereview.com/forum/index.php?threads/effect-of-loudspeaker-directivity-compared-with-in-room-measurements.21508/page-14#post-1031803
Not a peep out of him about that ;-).
I don't know how you missed my response on the next page:
"The first time I tried Lexicon Logic 7, I found it captivating. Sat there enjoying a few CDs. But then the effect grew old and constant errors in how it created multi-channel from stereo became too much so I did not go back to it. It is definitely no replacement for true multi-channel as Carl states."
That is not at all "vehemently anti-upmixing." I tried it and it grew old. And this was with Lexicon algorithm. Perhaps Aura3D is better (see below).
As to Dr. Toole, this is what he said at that link:
"The only "faux" multichannel that I have ever condoned is upmixing, and the success of that depends on the nature of the stereo mix and of the particular upmixer - there are several quite different options. None that I have experienced are gratifying for all recordings, but I now regularly use the Auto3D upmixer."
I quoted the key section for you where he acknowledges it is not for all recordings. He listens to a lot more classical music than I do. I listen to much more modern music. That makes a difference as to whether you like the "faux" upmixing or not.
Note that our multichannel room is strictly for watching movies. It is a window-less room and I don't enjoy sitting there for music consumption. My main music system is in a different place that doesn't make it easy to set up multichannel. The content I listen to doesn't come in multichannel so again, it is moot.
