Quoted from Pinfidel:
My RFM only has sound rom version 1.2 installed. There are some hilarious call outs. How many other call outs and what sound changes have been made from version 1.2 to 1.6? That's a lot of updates versions ahead. I just hope if I go through (from what I understand) all the considerable aggravation to upgrade the sound, it only add to the call outs and sounds and doesn't remove any of the ones installed now.
There were no sound changes made after 1.2.