If you've got a Mac, it's too easy. Drag a song from iTunes into Garage Band, crop out the 30 second part you want, and then export as a Ringtone back into iTunes.
Given that most people don't have a Mac, you'll need to do some manual work:
1a: Get Audacity, it's free.
1b: Open your song in Audacity (as long as it's not DRM protected, if it is, burn it to a CD in iTunes, and re-import it as an AAC w/out DRM then open that in Audacity).
2: Crop the song down to the 30 seconds you want, and save it. The extension should be .m4a. If you opened an MP3, you need to have Audacity or iTunes convert it to AAC.
3: Rename the file, change the extension to .m4r, and then drag that into iTunes. It should import it as a ringtone, ready to sync to your iPhone.
Using the iTunes only method in the video works if you just want the first 30 seconds, or if you know exactly when you want to start and stop within the song.
If you don't, it's nice to have the visual scrubber in Audacity or Garage Band so you can preview just the 30 seconds you have selected, and determine if that's what you want to use.
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Last edited by DarkWolf; 08-06-2008 at 09:33 AM.