Just a couple of thoughts about this. This version very well may be neither the original nor a midi karaoke version. Those two are sort of polar extremes, one being perfect and the other being the the worst possible re-creation. Other musicians could have been hired by a karaoke company to emulate the original song. But I also see no reason why there wouldn't be instrumental versions of these songs. Making an instrumental mix is the simplest thing in the world to do. You just mute the vocal tracks and hit play.
I highly doubt that any sort of filter is used when attempting to remove vocals from a song after the fact. You would have to notch out entire octaves of sound. It is inconceivable to me that filters could ever be used to eliminate vocals. Phase inversion and cancellation does work, by eliminating any information that is common to both the left and right tracks.
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