Thanks to all those who provided excellent comments (and sent private emails) in response to my request for help in understanding the compatibilistic view of free will. I have been reading them carefully and trying to digest them and will be posting a follow-up soon.
It is clear that this is a topic that is fraught with conceptual and linguistic pitfalls. It is easy to slip into dualistic phrasings that obscure the issues. On the other hand, trying to completely avoid them can result in ponderous and legalistic language that is less than transparent.
I can see that I am going to have to word things very carefully!