How can I do Karaoke on my computer?

Manny set up Karaoke in his house through his computer, but he's having lag issues. Leo says that the best way is to buy an all-in-one Karaoke box, as they're pretty cheap these days. But if he doesn't want to have that extra expense, Leo says there will be lag when plugging a mic into an analog jack. It won't be much lag, but it'll be enough to drive him a bit nuts. Leo suggests using different software that can compensate for that. Manny should try PCDJ. Another solution is to use a mixer, which would solve the lag problem, but it would be costly.