Yep, that's true. For now there isn't a user interface and doing some youtubes about the API is definitely planned. the API will remain around forever though, and is useful for generative composition today.

Do a checkout and you can see quite a few song files in the examples dir which should be helpful in getting a feel for it. UI should be out in a few months and will be more photogenic for youtube and will also ship with some demo tracks showing how all of the patterns work.