Audible Light Stack Solution

Suggestion is they get a lightstack with audible option. The sheet below has info on that. They can goto/call automation direct for more.

https://cdn.automationdirect.com/static/specs/patlite40mmLR4.pdf

https://cdn.automationdirect.com

Or

If they want to use their lightstack and add audible, then they could go with this:
https://www.automationdirect.com/adc/shopping/catalog/pushbuttons_-z-_switches_-z-_indicators/22mm_plastic/audible_buzzers/ecx2071-24r

But then they have to add Mcode to turn the output on to their post processor.