Why does some vocal remain?

Modern mixes use stereo vocal reverb, doublers, and parallel effects that are not dead-center. Only the fully centered core cancels.

Does it work on any song?

Best on classic rock, jazz, and old pop with centered vocals and wide instruments. Electronic and heavily processed mixes are harder.

Yes — subtraction also removes any bass or kick drum that was summed center. That is an inherent limitation of the L-R technique.

Subtract the center channel to thin or remove vocals — a karaoke-style effect. Works on stereo songs where the lead vocal is panned center.

Drop a stereo MP3 or WAV here

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Your audio never leaves your browser. The subtraction runs locally via the Web Audio API.