The Kenton Merge-4 4 In to 2 Out Merge Box allows you to connect 4 separate MIDI sources and combine them all into a single MIDI data stream. This enables you to connect 4 MIDI controllers or keyboards and merge all their data including MIDI clock MIDI time code and SysEx. Featured on the Kenton Merge-4 are 4 MIDI inputs and 2 MIDI outs that enable you to connect several MIDI devices to 1 or 2 MIDI ports. The Kenton Merge-4 combines opto-coupled MIDI inputs and separate drive circuits for each MIDI out socket resulting in optimum performance and quality.