Kenton Electronics MIDI Merge Box Merge-8

You can combine multiple MIDI signals into one, for example when you want to control one MIDI sound source with multiple MIDI keyboards or MIDI controllers. By pressing the button on the main unit to switch modes, you can also use it as two independent 4-input 1-output MIDI merge boxes. The main unit uses a sturdy aluminum case with a beautiful hairline finish. It is powered by an AC adapter, so there is no need to worry about running out of batteries, and stable operation is guaranteed. When the power is turned on, the Active LED on the back of the main unit lights up, and the LED flashes when a MIDI signal is received.