remove voice from record (karaoke)

[Georg Holzmann <georg.holzmann@xxxxxxxxxxxxxxxxx>]

Hallo!

For a fried I should remove the voice (female) from a record (base - 
drums - piano - voice).

Is there any software under linux with such a tool ?

I already tried inverting one channel and subtracting it from the first 
one, but it's not possible with that record ...

Thanks,
LG
Georg