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I'd say insanely difficult, if not impossible. You're going to have huge issues if the music is audible while the person is speaking. If that's the case, you're going to need something that can separate out elements of a complex signal. The only thing I can think of that might be able to pull that off is Melodyne...but I'm not sure even that will work.
Is ...
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I realize this is an old thread, but iZotope RX3 does a great job of this if the music is in stereo. What you can do is use the Center Channel Extractor in RX3, and it will use phase cancellation to isolate the mono dialogue from the stereo music. I work in a trailer house where we frequently need to clean up bites from movies with bad stems.
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I would say removing the music is impossible. Phase cancellation won't work unfortunately, the signals need to be mathematically identical for this to work, and if anything is off by a mm or if someone is not in the room you won't achieve this and (as Marco Lopez said) end up with high frequency residual at best, or mutilated dialogue and no cancellation at ...
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Evan if there is, it would be most likely based on stereo cancellation and eq-ing so it might be a better idea do them the proper way instead of relying on software
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I use an app to stream audio from my phone to the pc via WiFi (also supports micro-USB or Bluetooth) Could be a quick solution if you think your phone's good enough to record sound (mine barely is)
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This is not going to be easy, the vocal is all over the stereo-field so using a centre-channel extractor unsurprisingly didn't work well.
Except if the vocal track is fairly unprocessed and clean, its actually very difficult to remove it from the recording.
You could try using a spectral editor like iZotope RX, and remove it manually, or some clever ...
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