What does each slider in Fine Tune do?

Left = Less / Right = More

Favorites - Increase or decrease the amount favorites you have marked on the station will play on the station

Artist Discovery - Increase or decrease the amount that Slacker chooses a related artist instead of a selected artist.

Song Popularity - Changes the popularity of songs allowed on the station. When set to default (middle position), this allows an even mix of popular/non-popular music to play on your station. When set to the right (+) side, this will remove less popular songs from the station, causing only popular songs to play. When set to the left (-) side, this will remove popular songs from the station, causing only non-popular songs to play.

Year - Changes the portion of an artist's career that a song will be selected from. When set to default (middle position), this allows an even mix of new and old music to play on your station. When set to the right (+) side, this will remove older songs by the artist from the station, causing only newer songs to play. When set to the left (-) side, this will remove newer songs by the artist from the station, causing only older songs to play.