This is what I do, I find a mp3 of the song I want to make the mp3 file from. I use a sound editing program to clip out a 30second section of the song, and then use that section and put it to itunes. Then in your itunes go and create a aac version of that clip. when you go into the itunes section on your computer go and change the file from a m4a to a m4r extention, and boom you got a ringtone.