I think the only style included in the iOS app is medium swing.
Tempo is adjustable.
Other style packs can be obtained by the in-app purchase option. (jazz, Latin. Pop)
This keeps the price lower for folks who only want the app for "read-only" charts or simple swing practice tracks.
The android version includes all the styles.
Style packs only need to be purchased once. I think they're worth every penny... Have you priced BIAB?
)BOB