You might want to check this site out.:https://lipsync.studio/
I don't know what they're using, but it's worth taking a look. This site gives you the ability to have multiple dubs if more that one person is in an image. Far left, left, center, right and far right speakers. On their main page you'll see what I'm talking about. I tried one other online image to voice, had two people in the image, and both were synced to say the same thing. Kinda defeated the purpose.
I'm still new to this AI thing, but from what I've experienced, all of the good stuff is locked behind a paywall online and only certain things are free and open sourced.
Anyway, hey, thanks again for the copy and paste feature. My hand thanks you!