The description says, 'Mutes vocals for full Karaoke experience. Read the description of it. Voice Cancellation doesn't cancel outside voices like you expect (like all those other cool devices). You may be thinking what does Voice Cancellation have to do with this? Well guess what? The person who named it 'Voice Cancellation' is just stupid.
Go to Control Panel -> Hardware and Sound -> Sound -> Click on your Audio Device -> Click on Properties-> Click the Enhancements tab And there is still someone looking at this, reading, hoping for solution, then finding a unsolved problem. I don't even know if these accounts are active. I'm sad to see that this is 3 years old and still has no solution.