MP3 text on radio
 

I have a 2001 4.4 and I added an alpine CD changer that plays MP3 cd's and supports cd text. I know I don't have proper radio to display, but I remember a thread that was talking about a TSB on the older radios. It had something to do with losing the bass I think. I also had the newer radio part number. Does anybody know what thread that was? Thanks.