Paulo,

You may purchase just the Karaoke pro software if your computer is compatible to house the software and DSP engine. I will need to know what your specifications of your computer are to be sure it will work, and if not to be able to tell you what you will need. You may email me directly at dougc@mtu.com to talk about prices and what all you may need. Please feel free to call me at 919-870-0344 or fax at 919-870-7163.