Johnnymushio wrote:japanese singles all come with a karaoke track without the voice, but ive read everywhere that it doesnt work if you try to subtract the voice and voiceless songs
IF you have the full song on CD, (1)
AND the full song without vocals, also on CD, (2)
AND the backing mix on both recordings are from the same digital master, (3)
AND the mix on both CD recordings is identical with the exception of the vocal (which is absent from one) (4)...
then YES, you can isolate the vocal, and you can probably do it to quite a high degree, and even in stereo. It's then just a matter of lining up the two recordings accurately and inverting one of them.
but... you need 1,2,3 and 4.
If you only have the original full recording, or worse still, a badly compressed version of the full recording, then no chance.
Typically it is asked "I have this song that I recorded from YouTube - how do I remove the backing to leave just the vocal?"
The short answer is that you can't. The long answer is that if you spend a lot of time and effort with the specialised tools mentioned previously, you may be able to achieve partial separation, though the result of hours of detailed work is not likely to be impressive.
Of course, if you have access to the original multi-track recording, then as Koz says, it's a snip, just mute the channels that you don't want.