Can anyone point me to the PDF link for the original empeg tuner-module manual or scan and post it for me? I think it's just a single page. I swear I saw it recently either online or on paper but I can't find it now. Thanks guys.

And what is that dial with the numbers and letters for? It looks like a hexadecimal range from 0 to F.

Okay, I found the manual here thanks to Mark Lord:
http://empegbbs.com/ubbthreads.php/topics/333145/Factory_tuner_manual

And I learned that the dial is a tuner-id selector in case you use your player in multiple cars and have it retain multiple settings but I don't know if this feature was ever implemented in any of the firmware releases or not so that's my question now. Does anyone know?

Hijack has some features that take advantage of the tuner-id selector. I don't know about the factory software. I don't think the factory software uses it, but I'm not certain.

That’s good to know. I have another question along these lines. The tuner has RDS & TA so what I’m wondering is: are there any features that will automatically switch to or notify about a preset station that is broadcasting a traffic announcement at that moment?

No.