Canceling out BGM in a clip

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MousE0910

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Hello,

I've read about active noise cancelation and things like that and I was wondering about something.

If I have some clip that has BGM and some SFX on it and I have the BGM itself in MP3 form, would it be possible to generate some sort of opposite waveform that, when overlayed on the clip, would get rid of (most of) the BGM, leaving just the SFX? I realize perfect result is impossible but at least in theory, it should be able to minimize the BGM and help isolate at least some of the SFX, shouldn't it? Or am I on a completely wrong track here?

And if it is possible, how would I go about generating such waveform? I've looked online but found nothing about this and Audacity can generate just simple waveforms.

Thank you for any help or info you can offer
 
With the *precise* recordings that made up that recording, sample-accurate and processed *precisely* as it was on that mix, you could *in theory* null out the music bed. But as it's already MP3, that's pretty much out the window.

At this point, you're trying to take the flour out of an already-baked cake.
 
I was afraid that might be the case. Thanks for the reply!
 
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