Bob, sorry about that problem. First, the Acela is not a Legacy equipped engine. It is a TMCC engine. So be sure to assign it as such. That should result in your CAB2 displaying CAB1 mode. As for the actual announcements, I simply follow the Acela documentation...that's it. You can activate some announcements manually, and some activate automatically. Your choice of power and Legacy remote are OK. I'm running with a ZW-L and Legacy remote. I can't run my Acela at this time using a CAB2 as it's at Lionel right now for repairs. I hope this helps. Check the Lionel website: Resources and search on "Acela" You'll get a wealth of info to include the owner's manual and operating tips/help.
https://www.lionelsupport.com/media/servicedocuments/73-1714-250.pdf