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In the past few years MIDI hardware products have become smaller and smaller especially as many of them are meant to be used with mobile computing devices. But this has caused some issues as 5 Pin DIN MIDI plugs are pretty big. No one wants an accessory that's 10 times the size of the smartphone it connects to ! So recently many products have used a stereo 3.5mm minijack connector on the product itself with a breakout cable to standard 5 Pin DIN MIDI connector.