People seem to just love accessorizing iPhones, in order to bring them closer to becoming prosumer-level camcorders that just happen to also be able to make phone calls. We've already seen aftermarket zoom, wide angle/macro, panoramic and microscope lenses for the iPhone camera, along with an adapter that lets people use their existing DSLR lenses. There are also handheld condenser microphones that can be run into the phone. Now, Fostex has taken things a step farther, with its triple-input AR-4i audio interface for the iPhone 4.
Read the full article: AR-4i interface gives iPhone 4 an audio boost