At the DigitalLife press preview last week, my fellow intern Chris Gampat, witnessed the Pacemaker in action: It's a pocket-size DJ system from electronics company Tonium that lets you change almost any element in a song.

The device contains a mixing functionality to alter the speed and key of a track, bend a pitch, crossfade (blending parts of the song), reverse play, and much more. Other features include a cue button to control when a song starts and ends, a touchpad for for bending tracks, changing EQ values, and setting pitch values, a settings button to turn the system on and off, a rewind and forward a track, two channels to place songs, and more.

The Pacemaker sports a USB 2.0 connector for data transfer, a phones connector for 3.5 mm stereo, and a line-out connector for 3.5 mm stereo, so you can connect it to some killer speakers for a party. The device also has a 120GB hard drive and can play songs for up to 18 hours (or up to 5 hours for mixing). The Pacemaker requires Windows XP or Vista or Mac OS X.

Take a look at the Pacemaker in action, after the jump.