It turns out "Profile=General" must be turned on for the N900 to work as a Bluetooth receiver.

The silent profile on N900 mutes many pulseaudio modules that would otherwise be turned on, including "module-loopback".

Recent CSSU pushes made music "somewhat work" in a test linking a BB9930 to a N900, but it was very stuttery and jittery. My tests between iPad and N900, and Macbook and N900, have been totally unsuccessful thus far.

Think the next step is to reconfirm what the resample settings are.