For space reasons I have removed the power/midi portion of my axoloti. It's embedded in my keystep right now, but I don't like having to always connect the two with an external USB cable. My idea to make this connection internal, is to connect the USB VBUS and GND pins between the keystep and axoloti, and then use the keystep's MIDI DIN out to send notes to the axoloti (that way I can still use the keystep with my computer). There's one problem though, MIDI has IN+ and IN- but JP3 on the axoloti only has a singular midi input. What do I do with IN-?