How do I delete a ringtone?

[Pilot145]

I've created a few ringtones and I noticed (in part due to me trying to figure out my new X) that my ringtone menu has several instances of the same ringtone listed (example: "homersimpson" and "homer simpson"). I'm trying to delete the duplicates.

I found on the SD card under "Media" where some of them went, but not all of them.