I dragged a few ringtones I made to my iphone 4. Although they transferred and now appear under the ringtones tab (both in library and in device) they are grayed out, and further do not show up as custom ringtones in settings. Moreover, it is impossible for me to sync these ringtones to my phone through itunes without deleting all of my music and movies. Since I manage things manually this is unacceptable. I've done some digging on the internet and haven't been able to find an answer to this question. So does anyone know how I can transfer usable ringtones to my iphone without deleting all of my precious music?

I guess it somehow wasn't obvious from my original posting that my ringtones were under 30 seconds. Let me assure you that they all clock in at 29 seconds.