Clever,
You still haven't added to your profile your archicad version and OS.
I believe there was an iteration of AC that on the mac platform AC sounds were not able to be turned off. Since fixed.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"