Reply to Best way to filter out all instruments but the vocals

I know that this can't be pulled of to perfection, but I need to at least cut out as much instruments as possible.

The instruments / vocals aren't panned.
Once I use EQs it alwasys reduces the warmth of the vocals to unacceptable levels.

I haven't tried the knock-out-method so far but I guess the results won't be great considering I have a track with real instruments.

What else helped you extracting vocals in the past?

You can download the track I'm trying to extract the vocals from here:
http://www.ali.dj/bimmelbahn.mp3