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As with every iPod model that's come before it, the iPod Touch offers the simple and effective autosync feature. Autosyncing automatically puts a copy of every song, podcast, and video in your iTunes library right onto your player. In fact, the first time you connect your iPod Touch to your computer, the iPod Setup Assistant offers to copy all the music in your iTunes library over to your new player. If you opted to do that, your iPod is already set for autosync.
If you've added more music since that first encounter, the steps for loading the new goods onto your Touch couldn't be easier: