FastICA with PCG (audio)

Hello, I am trying to use FastICA to unmixed a sound (PCG). I have 1 archive (mp3 and wav) with sound mixed. Then I can't mixed this sound, only unmixed. But I am not get to use the FastICA, to test other sound I recorded 3 sounds of music instrument and try unmixed, but I did not had success.

Do you know some example for this work?

Thank you Nelson [e-mail]