CuePhase

Cuephase is audio player and dj tool. The idea is to have live playlist which can be updated on the run: add and remove songs, change order and set start and end times.
Prelisten songs either from library or from playlist with headphones, for this, you need to have USB headset or audio interface.
Cuephase features full iTunes integration. It loads songs and playlists from iTunes at start. After it has been launched it frequently checks for changes in iTunes and brings those changes back to Cuephase. If you add new songs or create playlists and switch back to Cuephase, they are there! All automatically
Songs are smoothly transitioned with fades.Audio levels are kept in balance with Autogain technology ; each song is inspected and audio levels are set accordingly. Cuephase also detects when songs actually end and sets start point before it; removes any gaps between songs.