On December 29, 2007 at 11:42, arnie said...
You have to go to File, User Preferences, the check the
box that says "Beep when a Button is pressed".
Thanks, arnie! That's exactly what I was looking for. It probably would have taken me days to find that on my own. The MX-980 Editor is an amazingly powerful and versatile program, but it does seem to be unnecessarily complicated in some ways. I suppose it doesn't really matter once you've gotten used to it, but it does make the learning curve that much harder.