hehe n0pe! Car hasn't seen been in a Nissan shop for a year or two..
It definately sounds like metal against metal.. I thought the power steering pump was shot, replaced it.. it wasn't the noise problem, but the bearings in it were shot anyways so it wasn't a waste

[phew]
How to describe the noise.. hrmphhhh
Maybe if you get some loose change and shake it in your hands? Just sounds like loose metal running across metal
When I had the front cover off there were slight slash marks from the chain hitting the head/block, but didn't look too bad. I figured since it was a chain there wasn't anything to replace.. [I don't deny my stupidity, I just choose not to mention it most of the time]
Maybe one of the tensioners is shot and the chain has slack so its slapping around..
AH!! THATS WHAT IT SOUNDS LIKE
Like its slapping something.. I guess.. um.. maybe I can record ito_O