Seems like it must be something obvious, but is there no way to cycle through preset channels from the driver's controls? Cars typically have a +/- on the channel from the steering wheel, but I can't figure out a way to do that from the steering wheel. The left side buttons scan forwards/backwards rather than going to the next preset.
Slightly related, with Slacker. I search for a band I like such as The Sword and I see that under "Artists" in the search. I click on it and I get "The Sword Radio" which plays a song by them, but then the next is by some other band. Does Slacker not actually stick with the band you asked for, but instead give you a channel of "similar" music?