DIY iPhone ringtones for free using nothing more than iTunes 8 iPhone ringtones are generally .m4r tracks 40 seconds or less in duration. Here this tutorial takes Windows PC for example, but the method goes the same way for Mac users. Step 1. Go to iTunes “Preferences”, set AAC as the Import Encoder and make sure the bit rate is 128kbps. http://farm3.static.flickr******** /2425/3697426216_emore