MIDI Out vs. MIDI Thru & how this little box can help you / MIDI Solutions Quadra Thru - YouTube
What Is MIDI? How To Use the Most Powerful Tool in Music | LANDR Blog
Amazon.com: CME WIDI Thru6 BT - 2-in-6-out MIDI Thru/Split with 5-pin DIN and Bluetooth MIDI - future-proof technology, high-speed transfer of all MIDI data, extreme accuracy for all MIDI devices : Musical