LG VX-8000

I am not sure if anyone has found this out yet, but when you add the mp3 files as midi and use them as ringtones there seems to be a problem. If you try and use the handsfree car kit, it will not play any sound on those ringtones for incoming calls. It did not make any sense to me, when I changed the ringtone to one of the standard ones that came with the 8000, it rang as it should. I have assigned many ringtones to friends and family already, what's the deal? Software issue? Car kit issue? any help? any fix?

Thanx
Larry