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I want to separate 2 or more voices from one audio file,
is there any software to this ?

I have done some googling and seen that the answer is NO in most cases.

But I think at least there should be a way to see different frequencies (just like waveforms) and edit those manually ?

I use audacity for editing audio occasionally but don't know if it can do this ?

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Well, Google is not lying. If you'd like to see if your particular case could be a YES, perhaps you could post an example (via Soundcloud) in your question. –  JoshP Dec 4 '12 at 15:38

2 Answers 2

Yes, it is possible, but it isn't easy.

There are a number of free tools for editing audio in the frequency domain. I haven't had much luck isolating specific sounds with them, but I have been able to do some sonic manipulation that wasn't possible with traiditional audio editors.

The latest version of Melodyne is supposed to be able to pick out individual instruments and notes from chords. I haven't used it myself, and it is fairly expensive. But professionals who have used it seem to swear by it.

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+1 for Melodyne (and its DNA technology), although it doesn't work so well with voices as with instruments. Worth a shot though. –  Ken Fyrstenberg Dec 4 '12 at 20:21
    
That makes sense. Spectrally complex sounds are much harder to isolate than spectrally compact sounds. –  ObscureRobot Dec 4 '12 at 21:29

Take "no" for an answer. (-:

If the voices occupy distinct frequency ranges you might be able to use bandpass filters to separate them. But this is highly unlikely, as most voices have most of their ranges in common.

Switch Audacity to FFT view to see where the voices fall in the audio spectrum.

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