ESI M4U eX - Professional MIDI USB 3.0 Interface M4U eX is a flagship MIDI USB interface from ESI Audio that revolutionizes the way you connect musical devices in your studio. This compact yet highly efficient device offers eight MIDI ports, each of which can function as an input or output depending on your needs. The configuration is detected automatically, and the status of each port is displayed by illuminated LED indicators on the front panel. Product Features The M4U eX interface stands out with the following features: eight MIDI ports (4 front and 4 rear), automatic detection of data transmission direction, USB 3.0 hub with three ports for connecting additional devices, standalone operation mode without a computer, and full class‑compliant plug‑and‑play compatibility. The device supports MIDI thru box mode (1 input to 7 outputs) and MIDI merger mode (combining 7 inputs into 1 output). Unbelievable Flexibility for Your Studio With the M4U eX you can simultaneously use up to eight MIDI outputs or eight inputs, as well as any intermediate configuration—for example, six outputs and two inputs. This is the ideal solution for music producers who need to manage multiple synthesizers, controllers, and other MIDI devices at once. The interface performs well in every scenario—from recording in a home studio to professional live productions. The ability to work offline, without connecting to a computer, makes it an indispensable tool for routing signals during concerts or rehearsals. Applications Recording and sequencing MIDI in professional DAW software Connecting multiple synthesizers and controllers simultaneously Routing MIDI signals in standalone mode (without a computer) MIDI thru box function—sending a signal from one input to multiple outputs Merging signals from multiple MIDI sources into one stream USB hub center for accessories—dongles, USB keyboards, controllers Detailed Technical Specifications MIDI ports: 8 (4 front, 4 rear) USB standard: USB 3.0 (backward compatible with USB 2.0) Power: from USB bus or optional external 5V DC power supply USB hub: 3‑port USB 3.0 hub Dimensions: 17.5 cm × 12.0 cm × 4.5 cm Compatibility: Windows 7/8.1/10/11, macOS Class compliance: 100% class‑compliant—no drivers required Materials and Construction The M4U eX was designed with durability and reliability in mind for professional use. The compact enclosure, measuring 17.5 × 12.0 × 4.5 cm, fits easily on a desk or in a transport bag. The clear front panel with LED indicators provides instant status control of all MIDI ports. The construction allows stable operation even during intense use in concert settings. Included Items ESI M4U eX MIDI interface USB 3.0 cable Optional external 5V DC power supply User manual Why Choose the ESI M4U eX? If you’re looking for a reliable MIDI interface that offers maximum flexibility with minimal setup, the M4U eX is the perfect choice. Eight ports in a compact enclosure, the ability to operate without a computer, an integrated USB 3.0 hub, and full plug‑and‑play compatibility make it the most versatile solution on the market. Whether you’re creating music in a home studio, performing live, or building a professional production setup, this interface will meet your expectations.