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Software for separating music from backround sound?

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Is there any software that will allow you to filter away voices and background sound away from music? It doesn't have to give a perfect result, but it would be useful to me. Thanks.
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There's no known software that I know of, and most likely it's going to take a lot of work and still sound really bad. What audio were you trying to work on?

<span class=“Italics”>MeBeJedi: Sadly, I believe the prequels are beyond repair.
<span class=“Bold”>JediRandy: They’re certainly beyond any repair you’re capable of making.</span></span>

<span class=“Italics”>MeBeJedi: You aren’t one of us.
<span class=“Bold”>Go-Mer-Tonic: I can’t say I find that very disappointing.</span></span>

<span class=“Italics”>JediRandy: I won’t suck as much as a fan edit.</span>

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Some incidental music from some TV shows, that are only on stereo/mono etc. I wanted to put a trailer together and needed some clean music.
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This question gets asked often, we ought to have a sticky. To the best of my knowledge:

  • With 5.1 audio, dialogue in the centre channel, it can be done with BeSweet by decoding into separate WAVs and extracting just the front left and front right channels. You will be left with music and effects, but dialogue should be mostly gone.

  • With 2-channel Dolby surround, you could try a 5.1 upmix (see Doom9) then discard the unwanted channels as above.

  • With stereo audio, it may be possible to reduce dialogue with an audio editor, e.g. Sound Forge, by the same vocal elimination techniques used to create karaoke tracks (LINK). Or you could try software such as THIS. Either way, the results are not likely to be perfect.

  • With mono audio, I don't think there's a chance in hell.

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    Thanks Moth3r, I'll try those out.