With version 1.2 of the Numark iDJ app, you can make synchronized playlists, custom mixes, and more on an Apple iPad, iPhone, or iPod Touch running iOS 4. Available now for $1.99 instead of $9.99, the Universal version of the iDJ app allows fitness instructors, DJs, music fans, and anyone else create playlists on their iPads or other Apple handhelds that perfectly match beats from song to song.

The iDJ app lets anyone make instant, continuous mixtapes of their favorite songs, complete with seamless transitions from one song to the next in perfect rhythm. Its intuitive interface make it easy to assemble customized soundtracks for workouts, road trips, dance parties, or any other event.

According to Numark, iDJ's patented BPM (beats per minute) detection technology makes music meld together as one, making it more than just a fast method of building mobile mixtapes. As songs are added, iDJ analyzes their sonic-waveforms, calculates tempos, and then automatically performs optimal transitions throughout the playlist. Using the iPad app, you can beat-match like a pro, and compile multiple songs in succession at the same speed, as if they were one continual song.

Playlists created in standard music libraries, notes Numark, simply crossfade from one song to another without concern for the beats in the two tracks; this often leads to poor-sounding transitions, changes in volume levels, or brief silence as the transition happens. In other words, those playlists are not good for dancing. The iDJ app avoids those brief silences and beat irregularities by analyzing the music in one's iTunes music library to ensure that a clear, smooth transition takes place between songs. The resulting synchronized playlists are much like the music mixes that experienced DJs would create, according to the manufacturer.

IDJ version 1.2 features:

• Create seamless, synchronized playlists of your iTunes music library
• Automatically detects songs' tempo and performs crossfades in perfect time
• Mix up to four songs at once for a completely new playlist experience
• Playlists can contain an unlimited number of songs
• Playlists can support audio WAV, MP3, and AAC files
• Manage your iDJ music using iTunes 9.2 (or later) on Mac or PC
• Supports iPad, iPhone, or iPod Touch running iOS 4

Numark's iPad app is now available from the iTunes App Store for $1.99. For more details, visit numark.com.