George, I knew you knew that. 
I don't see how limiting the consumer to not loading chain files is going to be a workable solution, they're just making more work for themselves and potentially more confusion. I have a bad feeling that here will be more problems and not less coming down the road. It would be a better solution to make sure all the chain files on the web were updated to be compatible with a mix of EMI and non-EMI boards so that when you loaded the new chain/sound files, you automatically got compatible files. I'm pretty sure that with a little programming work that the process of updating all the chain files to current versions could be accomplished en masse so that any downloaded files would not pose a problem. The board replacement instructions could then be to simply load a current version of the chain and sound files, job done.
