Connection	Purpose
1-12	MIDI note outputs. Can be mapped to any MIDI note number. Hi-Z in their normal "off" state. Can be either high or low when "on" (default is low).
+	Power supply +. Can be 3.3v or 5v.
-	Power supply - (ground).
LED	LED output. Hi-Z when off, low when on. Hook directly to GBA/DS LED test point or to a separate LED through a current-limiting resistor to +.
MI4	MIDI input. Connects to pin 4 of standard MIDI jack or tip of 2.5mm phone jack.
MI5	MIDI input. Connects to pin 5 of standard MIDI jack or sleeve of 2.5mm phone jack.
High	Bridge these two pads to make Midify outputs active-high.