Top Features 4-in/4-out MIDI interface > 64 discrete MIDI input channels, 64 discrete MIDI output channels USB bus power > requires no external power supply class-compliant operation with Windows XP, Vista and Mac OS X > true plug-and-play functionality compact and lightweight > mobile or desktop use In commemoration of M-Audio’s 20th anniversary, the Midiman MIDISPORT 4x4 Anniversary Edition gives the popular multi-port USB MIDI interface an updated new look. MIDISPORT 4x4 Anniversary Edition addresses a total of 64 x 64 discrete channels of MIDI I/O via USB, allowing you to simultaneously connect a variety of MIDI devices. Bus-powered architecture provides the option of totally mobile operation. Anniversary Edition The MIDISPORT 2x2 was first introduced in 2000—and quickly became the world’s most popular USB MIDI interface. This overwhelming success inspired the creation of an entire MIDISPORT line designed to meet the varying needs of diverse music makers. Our special Anniversary-edition MIDISPORT products commemorate this success with a brand-new look.