From Newsgroup: alt.os.linux

I had a user complaining about a program chiming when he clicked the
mouse on a graph. I couldn't reproduce this apparent bug.
It is an X11/Motif program, and they require Num Lock off to do any
mouse picking. Now I did the command
xset b 99
to turn on beeps when clicking. So I ran the program with Num Lock on
and now got beeps. The user was running Ubuntu. I have mostly used
Centos and a few other distros, and never noticed any beep before.
So I presume the default was beeps off except for Ubuntu?
--- Synchronet 3.21a-Linux NewsLink 1.2