Vocal remover

Most mixes put the lead vocal dead centre, identical in both channels, so subtracting one channel from the other cancels it. That is what this does, and what it cannot do follows from the same fact: anything else in the centre - usually the bass and the kick drum - goes with the voice, harmonies and effects that sit off-centre stay, and a mono file cannot be treated at all.

Keeping the bass puts the low end back from the original mix. For a proper separation you need an AI stem separator, which is a different kind of tool.