Pacemaker might sound like some kind of heart monitoring application but this particular application is about drum beats rather than heart beats.
Pacemaker is a music player as well as a complete music library managing application that's aimed at those who love to make mixes. Pacemaker works on a drag and drop principle, in the sense that you can drag and drop color coded effects onto your mixes such as reverse playback, fade outs and stretch effects. changes. The developers probably describe it best when they describe Pacemaker as "like conducting your own orchestra with a couple of spray cans in each hand".
When you start Pacemaker, you're asked if you want to import your music from iTunes. Along the bottom pane you have your library and the top pane is where you place your tracks to mix. On this top pane, you can drag and drop effects and fade-outs onto the tracks you've added. The added dimension to Pacemaker is that you can publish your mixes onto the internet. You can view all the top mixes by other Pacemaker users on the internet including the most listened to and even better, play them via the Pacemaker web player. This requires signing up to for a Pacemaker account however.
Pacemaker may not be as intuitive as iTunes but it's a far more advanced playlist editor and browsing through the mixes of other uses is a lot of fun.