The quality of any removed or extracted file depends on how that particular song was recorded and mixed. Sometimes vocals are recorded in a stereo field in such a way that prevents removal. If songs are recorded in this way, their vocals cannot be removed at all. This is why some vocals can be removed and some cannot. Therefore, users should not expect this software to remove vocals 100% of the time. In most cases, however, it will successfully remove vocals. Sometimes it might sound as if the vocal has not been completely removed; however when the user inserts their own voice, or if the file is then used as a karaoke tune, the listeners will only hear the new voice along with the original music.