RickO - Don't know if you've checked out 'You Tube' to see the video of the Santa Fe FA-2 set that I referred to above, but if you haven't just go on YT and google 'Santa Fe FA A-B-B-A Set - Nicholas Smith Exclusive Set'. The video is 22 minutes long and it should provide you (and anyone else) with as much info as you'd ever want about this set - particularly the Super Bass unit.
PS - The owner has a very nice layout and train room too.