Whether you're the next Trent Reznor on a MIDI controller or simply get a warm fuzzy feeling in your tummy when hearing classic video game themes, there's no denying the impact of the Musical Instrument Digital Interface specification. Three decades after its creators decided to collaborate and listen on a brand new invention, MIDI technology is now being used by more than 700 companies in a wide range of devices ranging from electronic keyboards and drum sets to video game consoles and cell phones. To commemorate its birthday, the MIDI Manufacturers Association just