I did online check-in for All Stars Music a couple of weeks ago. As the previous poster said, the options were choosing the floor and the section, plus near transportation and near elevator.
I picked Rock Inn and was a bit surprised to be put in the Country section at check-in "as per my request." I had brought the online printout with me, which clearly showed I had not picked the Country section. (No big deal, since the rooms are all the same, but it was odd that their computer showed something different from what I had entered.)
They offered to change the room but the Rock Inn was full with youth groups so we ended up in the Country building after all, and it was perfectly fine.