And I have to animate, yet again, in Motion Builder, like in the old 'Cousteau' days (my character Cousteau was animated in MB and only his face rig was done in Maya). Aaand... I was reading through the MB manual, and I see this little page: "Editing Character Animation". And I couldn't resist and had to do my own version of this page... like a tutorial... for someone wanting to edit animation in MB :D
OK, tutorial:
Editing Animation in Motion Builder
1. Open MB
2. Open a character in MB
[ Optional: 3. Learn animation ]
4. Select any rig controller
5. Start editing animation!!!
:D