What is this sound!?! (video/audio content)

[A4 Effort]

Okay - so the sound i have coming from the front passenger-side of the car isn't what i thought it was originally, and it has been driving me nuts!!

I hit a bitch of a pothole driving up to Pittsburgh back in May and i had the Audi dealer inspect things to see if anything was damaged - they said everything was fine (except for my bent rim) and that the control arms were still good.

Could someone PLEASE tell me what this sound is? I've ruled out brake pads rattling as it still occurs under heavy braking. You may need to turn your speakers up (promise, this isn't a "screamer"), but the sound is really noticable starting at the :20 second mark.

http://s45.photobucket.com/albums/f9...t=MOV00663.flv

The sound/rattling is more audible at lower speeds, but i can still detect it, if ever so slightly, at higher speeds as well. It obviously is louder when i go over bumps in the road, but even while driving on a road that is relatively smooth, i can still hear it. It almost sounds like something is flapping against something as opposed to something metallic. I can't tell if it's suspension related, or if i just have something loose underneath the car. My other thought is the skid plate, but i'm not 100% sure.

[A4 Effort]

Morning bump - no one?

[Kaytek]

Just taking a wild guess here, but did you poke your belly pan or the fender liner to see if they are loose?

[A4 Effort]

Fender liner is secure. Going to double-check the belly pan this weekend. I reached under the car and gave it a quick feel however, and it seems secure as well. But i'll know for sure once it get it up on ramps.

I got a suggestion on another forum to pull the wheel liner and to check behind it as stuff resides back there that may have come loose.