REALLY EASY!!!

There are built in transitions that you can use without using a mixer.... What the hell?!
Also check out the link below. It's got videos.
Product Overview
The SEP-C1 is a dual media controller that lets makes a DJ's life easier with the help of Pioneers DJS software for simpler control of playback, as well as 4.3 color LCD panel and dual area-color Organic Electroluminescence displays for seeing what you're doing no matter what the lighting situation. It can also be used as a full MIDI controller and supports control of other software, such as SERATO Scratch LIVE without the need of the control discs. Now you can get the party started without any need for a keyboard or mouse!
Includes Pioneer s DJS all-in-one DJ software application for playback from a Windows based computer which makes it so no mouse or keyboard is required for navigation and DJ performance
Supports control of other software, such as SERATO Scratch LIVE without the need of the control discs
Can act as a full MIDI controller for any MIDI-compatible PC application
High-resolution 4.3" color LCD panel
Intelligent GUI and rotary selector enables rapid track search through large collections of digital audio files
Play list function also speeds the track selection process for recalling frequently played songs
Auto Mix function automatically mixes playback of the tracks registered on the play list in four modes such as ECHO or ZIP
Audio is seamlessly beat matched and mixed on the fly
Area-Color Organic Electroluminescence (OEL) Display: Two high-visibility area-color OEL displays provide outstanding visibility for the pitch, playback time, and position information which combined with the main 4.3-inch color LCD, ensures smooth DJ play
Eight effects within Pioneer DJS (Delay, Echo, Auto Pan, Auto Trance, Auto Filter, Flanger, Reverb and Pitch Shifter) add versatility to mixing performances, and can be synchronized with the music tempo (BPM) at the click of a button
Tempo Control Range: Choose among four pitch ranges available for the tempo slider: ±6 , ±10 , ±16 , and WIDE
Pitch Bend Button: Enables fine adjustment of the track speed by simply pressing a button
Seamless Loop: A loop can be set from as small as one frame up to an entire CD s length and repeated without interruption
Hot Loop: Restarts the loop seamlessly from its entry without interruption of the music
Auto BPM Counter: Measures and digitally displays a track s tempo
Rack-mount ready which is useful for club/studio installations
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