I didn't find an answer to this either, but I figured out a workaround.
Before I upgraded to ICS, I had one custom ringtone in:
/mnt/sdcard/media/ringtones/
and ICS still picks up that file when I go through the list of possible ringtones
so what I did was every time I wanted to use a custom ringtone, I would just rename my new file to the same name of that one old.
It's not a real solution, but at least you can change mp3 ringtones if you wanted to- that's if you had at least one before updating.
I had considered going back to Gingerbread and then putting in mp3 ringtone files given them numbers as file names and then update back to ICS and do the renaming thing whenever I wanted new ringtones, but I don't have the time or patience.
If someone tries it, let me know how it goes and how long it takes.
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