how to make custom ring tones???

i have got a I850 and i have found some site with ring tones but i what to make my own. i have MyJal, Power MP3 converter, EZ MP3 converter, and Digital media converter they all will convert my MP3's to wav. files but when i try to put them on the phone i get that communication error. i think it has something to do with the bit rate but i'm not sure. could someone please advise......
 
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