[Avelino Herrera Morales] wrote in to tell us about his Game Boy Advance MIDI project. It’s pretty neat since it only takes two resistors and a link cable to use. The link cable has a slotted connector so you can use a chunk of protoboard to connect to the pins. He has software the does all of the MIDI packet generation. As an example, he uses the GBA to control a Chameleon synthesizer.