VOCOPRO Mixer, Black (SINGTOOLS). A built-in vocal eliminator reduces up to 50 percent of original vocals recorded on center channel of non-karaoke trac. You’re already purchasing the item. We always aim to respect the rights of creators who make the stuff we sell. This includes their Copyrights, Trademarks, and Patents. We’ll sort it out ASAP by removing anything that’s causing an issue while we investigate any intellectual property issues that have been brought to our attention.