virtualbox.org

that's the problem , the audios are getting together.
What I record / hear in one, I just recording / listening in another.

which may be the error?

The reason I asked how you would do what you want on three real PCs is because if you don't know how you would do that with real PCs, then it would only be harder on virtual pcs. Plus it wouldn't be a VirtualBox question if you can't do what you want on real PCs.

Managed to solve .
I had to install win7 on virtualbox and use the audacity , it has an option that changed MMA for windows WASAPI.
i do not know what it means, but it worked.
i will seach this function now.
Thanks man!!!!!!!