LG enV2 (VX-9100)

Does anybody know if you can use ringtones that you save onto your memory card with this phone? I want to set up ringer id's for my contacts but I really don't want to have to buy a bunch of ringers from Get it Now again. I.ve saved some ringers in the MySounds folder on my card, but all that comes up in the ringtone list are the crappy preprogrammed ones. Any advice would be appreciated, thanks.