I can play a portable MP3 player through the aux port without problems, BUT...when I plug my laptop to it I get a buzzing sound, what gives? I've tried 3 different cables and they all do the same thing. Is there a rating on the aux??? The only thing I can think of is the speaker output port may not be getting the full contact with the jack.

Well, I figured out my own problem. For those who use a laptop in their vehicle and power the laptop with an inverter (ac-dc)...it causes a lot of noise, that's why I was getting the buzzing sound no matter what jack I used when I plugged into the AUX. I got my old adapter (DC-DC) and it solved the problem. No more buzzing sound thru the speakers. I hope this thread will help laptop users that decide to use power adapters and plan to use the AUX for sound in their Titan.

you answered before i could. i took a trip to jersey a couple weeks ago and it took about 10 mins of searching for me to figure out it was the inverter.
i would listen to the radio while the laptop charged, then play movies and listen to the music saved on my laptop.