hey everyone. i have a quick question. i had the mpx200, but now i have the mpx220. and on the mpx200 i used all wav. files for everything (txt msgs/diff people) and all i did was store everything on my sd card. and now the mpx220 uses all mp3's. where do i have to store it so that i can use it for diff ringtones for diff people. also when i save an mp3 file on my phone, i can use it as a ringtone, but not a txt msg. where do i have to put it so i can use it for both? thx!