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.


  • compact device (1/3 rack size)
  • 4-in/4-out, 64 MIDI channels
  • High-speed connection to USB-equipped PC or Mac
  • Hardware MIDI time sync
  • MIDI activity indicators for each port
  • Plug-and-play installation
  • USB bus-powered
  • Windows 2000/XP/Vista/7/8/8.1/10, Mac OS X and Linux compatible
  • optional ESI MIDI Port driver for multi device / multi client operation under Windows available
  • compact design with around 14.5 cm x 10.0 cm x 4.5 cm