I have just found that bash does not "beep" in Knoppix 3.8, 4.0 and 5.0

I have looked everywhere in the system (/etc/profile, /etc/initrc, ...) to find out why it does not beep, but I have not been very successful

Programs than rely on escape ANSI console codes for sound do not make any sound either, and this is the heart of my problem. I have a couple of computers running those programs with Knoppix 3.8 that will be very hard to reinstall now just for that, and the beep in such programs is very important because the users most of the time are not really looking at the screen, so the beep is very important to alert them in case of errors.

Any body knows a solution ?

Thank you.