If you want to DJ your next party using just your portable Mac, check out Native Instruments' Traktor DJ Studio 2.03. Designed with professional DJs in mind, the program has now made its way to the Mac.
It offers an entire DJ environment on one screen, so you can mix, speed up or slow down, and apply cool filter effects to your songs - all in real-time.
You can organize music files into a playlist, and each playback deck displays a waveform of the current song, showing its beats. You can use the tools in the Mixer window to create smooth transitions between tracks. For more details, see “Command and control", left.
Matching tempos of different songs is where Traktor shines. Simply define the song that's playing as the master, and Traktor will calculate the beats per minute and adjust the cued track to the calculated tempo. Usually, changes in tempo and EQ degrade sound quality. Not so with Traktor - the edited material sounds great.
Traktor DJ Studio 2.03 is easy and fun to use. The fact that you can leave your bulky, expensive DJ hardware at home and just bring your laptop to your next party makes this well-ordered program well worth considering.