Okay like cool!
At first I thought that it was just another poor and naive soul looking for some majical gadget capable of removing vocals out of any mp3 file.
I find folks like that here and there. LOL

I have to go with what Sheriff said. THey are useless and expensive machines. Made for drunk minds for entertainment purposes of some sort.

IF those videos you've mentioned do exist they definitely exist somewhere in different forums...

Okay okay! I'm just kidding. I don't even know much about karaoke actually. Never really got to use one. Always had a band with me.

-ED-