OK, so the user manual doesn't say anything about how to use slacker. Most stuff I can figure out or have gleaned reading the forum, but I have a couple questions. I assume the "favorite song" button is supposed to cause the song to be played more often. After a few hours of listening (over several days) I don't think I've ever had one of the songs come up again. How is it really supposed to work? Also there does't seem to be a way to list or control your favorite songs. What is custom stations for? Is this something you can only use with a paid account (i.e. not the account that came with the car)?