This is a splitter box for e-drums. The goal is to split dual zone pads into two single zone pads which allows to expand the drum kit by adding cymbals for example. 
List of materials needed : 
 

• 3x stereo female connectors : [https://www.amazon.fr/dp/B0DNZ1S36M?ref=ppx_yo2ov_dt_b_fed_asin_title](https://www.amazon.fr/dp/B0DNZ1S36M?ref=ppx_yo2ov_dt_b_fed_asin_title)
• 2x m3*10  machined screws (threads directly into the bottom piece) 
• Some wires, solder and a soldering iron
• a 100 KΩ resistor ( it may even work without) 
• two mono 6.35mm cables
   

Follow the schematic i put in pictures and you should be good. It is best to bend the connector pins to have more space and to cut the ones not used. I tried this on a Roland td9 and it worked like a charm. Just remember that the splitter will only work on dual zone pads and not dual zone cymbals.