Thankya! to solidrock, GHinCH and soolan. Starting with a few downloads, working by trial and error, confused, I managed to put together a good Danny Boy arrangement, with the key, tempo and style I like. BIAB might be the most feature-rich application I've ever used. For complexity, I think it actually beats PhotoShop. BIAB does seem miraculous, once you graduate from newbie status.

I suppose it's a copyright violation to post BIAB arrangements of copyrighted songs, and I imagine this board doesn't allow it. I'm learning about some interesting work-arounds. On the other hand, it's pretty easy to roll your own arrangement, for private use.

I've got another question, unrelated. I'll start a new thread. Thanks again.