Amadeus pro Question take 5555

If both tracks last the exact same time length and are in sink with each other, i'm assuming this is the case, by the way; go to the start of the project, I do this via comand a to select all, to insure i'm at the exact start of the project. Then, you have two ways of doing what you want.
1. You can, paste over, command shift v or,
2. You can, paste to new track, command option v.
The second option is what i'd recommend as it give you control over both tracks.

If you mean pasting the second track as the first one plays, you should be able to, just make sure the track will be placed at the start of the project.

You should be able to. Honestly I haven't used amadeus in a couple of years, moved on to reaper, but if memory serves, this should be possible yes.

Reaper is accessible on the Mac with OSARA.

I mean in amadeus your missing a lot. I.e: cant use vertual instruments, most plug ins, if not all, are not accessible. I mean, you've only got the presets but that's it. You cannot modify any parameters or anything, save a few plug ins but with most this is the case at in amadeus. I love amadeus but I switched to reaper because I needed a better more versital daw.
I don't remember how to do what your trying to do in real time as the first track is playing. If you just paste it should work, if the insertion point doesn't follow playback as its playing back. Alternatively you could just go to the begining of the file, paste the vocal part into a new track and then hit play, and do what modifications you need to do.