MIDI Thru 1 input - 10 out splitter midithru box DIY kit Not assembled

Midiman USB Midisport 2x2 MIDI Interface w/ Cable Dual In/Out Ports Not-Tested

DOREMIDI THRU-6 MIDI Box 16 Channels 6 Output 1 Input 5 Pin MIDI Interface

Teensy 3.2 MIDI Breakout board, 3in / 3out, USB midithru box DIY kit

Midiman Macman Macintosh Midi Interface

Midiman Merge 2x2-2 In/2 Out MIDI Merge Box

DOREMiDi USB to Midi Converter Host Box High Speed Midi Interface UMH-21

MIDI Host Box MIDI Host RS485 to MIDI Converter