Using the player in conjunction with a second turntable and/or an external mixer unit, DJs can apply real-time digital jog break effects including Jet, Siren, Wah and Reverse. Seamless looping is available via the CDJ's intelligent beat identification software, automatically accessing a section's strongest breakpoints to minimize popping and clicking. Master Tempo control is adjustable through a single locking knob for manual beat-matching, with Fader Start and Relay Play automations offered for smooth real-time manipulation. All applicable CD text and MP3 track data is displayed on the unit's single-line LCD display, providing users with visual confirmation of their current or upcoming track selections. The CDJ-400 also has to the ability to connect and control external DJ software like Native Instruments Traktor or Serato Scratch Live, greatly increasing the amount of live performance applications.
