It cannot be done. I guess there may be a million pound piece of equipment in some studio somewhere that could get you near but to us mortals.......no chance!
If the vocal is at a completely different frequency to any of the instruments there may be a chance of reducing it with a good equaliser but you will still hear a muffled vocal.
My suggestion is to go out and get some high quality Karaoke tracks. It is amazing how good some are.
Good luck!
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