Nokia lumia 800 Custom ringtones not the already set ones?

Dave Asked: Nokia lumia 800 Custom ringtones not the already set ones?

Does anyone have one?? How do you add your own custom ringtone, I have downloaded an app that doesn't work.

I have also have done it by the ZUNE sync, have done all what im told but when I goto the sounds the ringtone isn't there. It's within the limits of what the instructions tell me

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Am i missing something?