It really works after change the extension name of Anymix, and then I copy Anymix from Nuendo 10 ( Don’t have 11 ).
I think it works fine on Nuendo 12, but the upmix function has a small issue.
The audio mixdown file only LR have waveform, the other channel are silence.
But if I use real-time export or record in the project, it’s all good.
Is this a bug because replace the previews version of Anymix?
Does Anymix is the same version in Nuendo 10 and Nuendo 11?