Well guys,
Thanks to everyone for all the information, suggestions and advice on my questions about which ERR products to use on my 4 engines that I asked about. Looks like it will end up being the Cruise Commander and a couple of different steam Railsounds Commanders for all these engines. Plus GRJ's chuffer products. I will need to make a few inquiries with a couple of reputable installers to see about getting in line for having these upgrades done when the various products become available.
Nick