USB Integration and MP3 Playback
The CDJ-400’s cosmetic design is simple and compact yet elegant with all of
its various controls and features located directly on top of the unit. A
USB port found on the face of the player allows DJs to play their MP3 music
collection from a wide variety of portable music devices such as thumb
drives, MP3 players or external hard drives. With the use of a
multi-function selector knob/button and its large, bright, dot-matrix LCD
display, locating and accessing of files from these types of music devices
as well as MP3 music files on CD and CD-R/RW through the CD slot are done
with a turn and press of the knob.

DJ Software Compatibility and MIDI Control
With more of today’s DJs utilizing different DJ software for their
performances, the CDJ-400 is also equipped with a PC mode. In this mode,
the CDJ-400 is a native controller for software such as Pioneer DJS2
computer software and SERATO® Scratch LIVE3. For example, the movement of
the pitch slider on the CDJ-400 can control the pitch slider on the
computer software and no timecode CD is required for audio control. The
player can also act as a MIDI controller where the user can assign
virtually every button on the player to trigger functions of various DJ
software programs.

World’s First Scratch Jog Effect
A highlight and an advancement of the CDJ-400 is its scratching capability.
In addition to traditional “vinyl” mode scratching, Pioneer implemented the
World’s First Scratch Jog Effect. Three highlighted buttons, each assigned
to a special effect, Bubble, Trans and Wah, creates unique scratching sound
effects that can be enabled by the DJ on the fly. A “hold” button was also
added to retain the different effects throughout the session or until its
release, which can also be triggered at any point of play.

Additional features in the CDJ-400 include:

• Digital Loop functions: A variety of loops can be created for additional audio effects
• Beat Loop: Automatically creates four beat loop based on the beats per minute (BPM) of music currently being played
• Loop Divide: Rhythmically divides the loop in halves to create different patterns
• Hot Loop: Restarts the loop seamlessly from its entry without interruption of the music
• Digital Jog Break: In CD mode the CDJ-400 contains three effects, Jet, Roll and Wah, which further enhances the audio by simply rotating the jog dial. The same buttons for the Scratch Jog Effect are assigned to the Digital Jog Break which are accessible at any point of play
• Tempo Control: Four tempo modes, ±6%, ±10%, ±16% and WIDE4, provide additional speed control with a resolution of 0.02% in the 6% range
• Cue/Loop Points: Up to 10 cue/loop points per disc, for up to 920 discs can be stored in memory
• Jog Indicator: A break in the red halo illumination around the jog wheel provides instantaneous feedback to the DJ
• Customizable Jog Wheel: The top of the jog wheel can be removed enabling the user to add their own customized image
• Digital Output: A digital output is available for a direct connection for clearer sound to a connected mixer
• Resume Function: The function takes effect if a CD is ejected accidentally. Once the DJ re-inserts the disc, it automatically starts playing from exactly the point where it stopped