07 MCS, week 34 build with factory nav.

I've searched all the threads here, including using Google's site search to actually find related links, but still haven't found this question.

Is there a way to adjust the door open/key in chime volume when you have the Nav system? I found 1 post mentioning a "gong" setting on the audio page however my Nav system doesn't have that. They same thread mentioned it had to be a week 32 or later car. Since mine is a week 34 car and has all the other updates that came around week 32 (sport in the tach display, cruise control set speed display, new TPMS system), shouldn't it also have this feature?