500 miles in, your turbo is still going to do a little self-machining. As long as you've got oil pressure and coolant circulating I wouldn't concern myself too much right now, provided the car is still pulling like you'd expect. Change your oil in another 1000 miles and then start to set a baseline for the types of noises you can expect it to make. As far as I know and can tell, it doesn't make anything that sounds completely abnormal. Especially since it sounds like you're already on top of potential trans issues.