Ringphone HD is an application that allow you to easily create ringtones for your iPhone. - select your track from the music library, tapping on the "List" button; - set the start/end points of the ringtone moving the vertical bars and scrolling the waveform view (remember that the length cannot exceed 30 seconds); - when you have finished, choose a ringtone name and tap on the "Save" button; - open iTunes, select your device, press the "File sharing" menu and look in the "App" section; - select the "Ringphone XP" icon and you will see the file of your new ringtone; - playing the file, the ringtone will be automatically inserted in the "Ringtones" section of you iTunes library; - finally, sync your device with iTunes and the ringtone will be ready for use.