bwahahaha. noise number 2... I LOL'd.
If you have the stock head unit, i believe it has a multi disc changer in it? I could be wrong. We had that issue and I think its the radio checking what discs are in the player. We changed out to an aftermarket head unit with the navi kit for a double din screen and haven't heard it since. This was a few years ago. found this thread while looking for something else. Had to add my comment about the OPs accurate description of noise #2 as well.