Users can create custom ringtones from songs purchased from the iTunes Store for a small additional fee. The ringtones can be three to 30 seconds long from any part of a song, can fade in and out, pause from half a second to five seconds when looped, or loop continuously. All customizing can be done in iTunes,[78] or with Apple's GarageBand software 4.1.1 or later (available only on Mac OS X)[79] or third-party tools.[80]