I am planning on getting a new HU for my 1999 TL and was wondering if I can use my MP3 player if I hooked up my mp3 player through the cd changer rca, thanks alot

 

what I mean is, you guys know how you can hook up a mp3 player with the blitzsafe and the stock hu? Doesn't the blitzsafe act as a cd changer rca cable, So if I get a aftermarter HU can I hook my mp3 player through the cd changer rca on it? Also i remember a while back I read a way where if you rename your playlist to CD 1 or something that you can control you mp3 player with the steering wheel control and the stock HU, mp3 player acting as a cd changer. an anyone confirm this?