The heart of the product is the BoardX Motherboard, essentially a blank slate with a mini solderless breadboard and a host of ports for plugging in add-ons.
By doing some of the heavy logical lifting for you, littleBits hopes that potential electrical engineers and prototypers can focus on the goal rather than the minutia of laying out a breadboard or soldering resistors in place.
On your breadboard connect the MIDI circuit as follows: The collector is connected to a 220 ohm resistor which is connected to the second pin from the left on the back of the female midi connector (labelled pin 5).