Re: Keep voice, remove background noise and music

As I said, no magic involved and it isn't recognizing the voice. It is recognizing correlated audio. There is enough of the background noise that is both correlated and uncorrelated that your ears are tricking you into thinking that it has been untouched. The fact is, you're removing a large amount of the background noise with any of the vocal removal tools. And the "a capella" preset is doing the exact opposite. It's leaving only the correlated audio. Everything you hear when you use that preset is exactly what's being removed when you use a vocal removal tool.

What you're trying to do does not work with your analogy. A much more correct analogy is that of trying to "unbake" a cake. Take a baked cake and get the eggs out of it. I dare you to try. A good scientist could remove and isolate large portions of egg product, but they certainly wouldn't resemble eggs anymore.

The Center Channel Extractor works better than most tools because it combines traditional polarity tricks with FFT processing. You can read about the basics of phase relationship here: http://en.wikipedia.org/wiki/Phase_cancellation

Emmett