Three functions in one device: USB MIDI interface, MIDI Thru, and MIDI data mixing. MIDI interface with 4 inputs and 4 outputs, supporting up to 64 MIDI channels. High-speed USB connection to PC or USB port for fast, reliable data transfer. USB-powered, no external power required, with precise MIDI timing and sync. MIDI data mixing: combines data from inputs 1 and 2 to the 4 outputs. Use scenarios: - Studio routing: connect two controllers to inputs 1-2 and send a mixed MIDI stream to four external synths or DAW tracks via outputs 1-4. - Live performance: plug into a USB-powered laptop, drive four hardware devices in real time with tight synchronization. - Portable workflow: no external power needed; use as a compact USB MIDI hub for on-the-go sequencing and performance. Compatible with USB-enabled PCs and USB ports, delivering a compact, reliable MIDI solution without added power requirements.