Panasonic 920p

Hey guys, I tried to find it all lately, but I get the failure to find how to make a ringtone high quality. I have a file converter software being called Format Factory "it does file converter mp3 to amr playing on my 920P (Panasonic), cell phone, but it also gives me a terrible quality. It converts the file to MMF, but it does not play on my phone. Could you please guys help me with that?

Thank you in advance I'll appreciate the answers.

http://www.ventones.com

Step 1 download a music file
Step 2 select the part of the file you want as a ringtone
Step 3 they text it straight inside a text message

free