The CDJ-400 is a model in the CDJ-range from Pioneer Corporation that was released in the late 2007. It is similar in size to the CDJ-200, but comes with scratching abilities and effects, can be used as a MIDI controller, as well as being Pioneer's first model to have a USB input with easy access on the top of the player. This makes it possible to play MP3 music from a USB memory stick.
On the back of the CDJ-400 is another USB connector that can be used to connect the CDJ-400 to a computer. This will enable the MIDI control possibilities so the player can be used to control various types of DJ mix software. The CDJ-400 has a built in USB sound card.
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