Free custom ringtones on your iPhone: Still a reality.
There’s always been a few ways of weaseling your way through iTunes and turning a 30-second clip on your computer into a usable ringtone. iTunes 7.4 locked most of them down. For some reason, 7.5 opened some of them back up.
1. Convert the clip in question to a .m4a or .3gp file.
2. Rename the extension to .m4r.
3. Drag into your iTunes Library and sync up.
4. You’re done. Really.
This is tested working on 7.5 and iPhone version 1.1.4. I’ve now got most of my original music on my iPhone, ready to ring and ring. Joy.