RockvilleBear and GGG,
Thanks for your responses.
1) It is an A-B-A set of Premier ALCO FA/B-2 w/PS3
2) I even considered adding a second B unit.
3) I will contact MTH tech support to see if PS2 sound 'will play with' the PS3 in the A unit as I don't believe PS3 kits are available.
4) While sound is all I really want to add to the trailing A unit, making it a seperate unit is not out of the question either.
5) I would be doing the upgrade/mod myself - so it's a labor of fun.
Right now I am seeking the advise/information before I take any steps toward doing this.
As always, I appreciate the help and advise of those who know.