ringtone syncing iPhone

I have created ringtones. They do not appear in Itunes music, they do appear in Ringtones. In Itunes, when the ringtone is clicked it plays correctly. I have tried to sync with either all ringtones or selected ringtones selected, along with Sync ringtones being selected. Itunes is set to automatically sync when Iphone is connected. I am using a WinXP computer. Its a brand new phone with 16Gb and all other sync items have worked flawlessly.
Suggestions for troubleshooting would be appreciated.
So far all of my attempts have failed.
Gateway