My Space Shuttle has its original factory ROMs, and the sound ROM is labeled as Rev3.
I have a spare burninated System9 board for a project/parts, and noticed its sound ROM is labeled Rev4.
Now I can't say that anything strikes me as "wrong" with the sounds on my Shuttle. Or is there, and I just wouldn't know? Sounds are sounds, especially in the early solid state era where they're basically simple patterns generated "live" by the sound processor (as opposed to recorded samples).
So why would the Sound ROMs be revised multiple times? Does anyone know if I "should" update my game to the newer version / are the sounds different... or should I leave well enough alone?