Plug and Play. The best-selling MIDISPORT 2x2 is a two-in, two-out, USB Midi interface for Windows and Macintosh. If you have more than just one keyboard or sound module, or more than one controller, the 2x2 is perfect. Since it is parasitically-powered by the USB port, the 2x2 is convenient and great for laptop use. Upward Mobility. Buying more Midi gear? No problem. It's easy to add more midiports to your system. You can add as many USB Midisport interfaces to your computer as you have USB ports. What is USB? USB (Universal Serial Bus) is a standard interface port on desktop and laptop computers. Nearly all recent computers provide USB ports, both Windows and Macintosh computers. USB supports the connection of up to 127 devices simultaneously, any of which may be plugged into or unplugged from the USB bus at any time -- even with the power on! Whats more, it is the perfect solution for portable users, as all recent laptops also offer USB ports. Everything remains external to the computer and ther