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But if I simply wanted to remove vocals, I'd probably go the karaoke route.

Yep. This will most likely get you a much cleaner version. assuming it's a well done version.

Or.... you could build your own version with Band in a Box.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.