https://deftaudio.com/store/tproduct/823081731212-midi-thru-2input-gt-10out-splitter-pcb-o
MIDI Thru 2input - 10out splitter PCB or a Kit
This MIDI Thru box is the dual configurable 2x Din5 input to 10x Din5 outputs splitter. Available assembled, as a kit or a plain PCB.
or amidithrusplitterpcb