4-in/4-out USB MIDI Interface
M4U hits the perfect balance between MIDI connectivity and mobility. With 4-in/4-out 64 MIDI channels and the same hardware based MIDI timing technology as M8U, M4U guarantees the best performance in your live concert. With compact 1/3 rack size, USB bus power and Plug-n-Play installation, M4U is truly easy to use and easy to carry. M4U is specially optimized for usage under Windows, but also can be used under Mac OS X and Linux with basic support. No drivers are needed for Windows XP and above.
Note: the newer M4U XT has since replaced the existing M4U.