I recently purchased an AX310 & was trying to do some custom ringtones. I successfully uploaded an MP3 & it showed up in "My Audios". When I went to a contact & attempted to use that ringtone for that contact, I browsed to "My Audios", but the folder was empty. I then tried sending it via MMS, but that didn't work either. BitPIM doesn't recognize this particular model. Ideas? Suggestions? Thanks.