Unmix a duett of vocals

i tried the module unmix multivocals for a simple duett of two voices and it does not find vocals ? what i am doing wrong ? Thanks

btw the modul for unmixing drums ist working very well

The Unmix Chorus module will often separate voices very nicely. That is, if there are no other instruments on that layer.

I’ve seldom had success with Unmix Chorus or Unmix Multiple Voices

I just tried it in SL12 the other day. In my case the same person is singing all the harmonies and the Vocals had already been unmixed from the song. Manual selection I find to be pretty good.

Does reverb have much to do with unmixing, I wonder? I do not typically remove reverb or any fx before unmixing music.