I never hear it either. I have used one since 1999. The flashing display and alarms are just that poor. I just turn them off as they are ineffective and totally un-necessary.
My personal take on the issue is if you rely on an alarm to keep you within a dive profile then you have done too many things wrong already. You should never hear an alarm during a dive and if you do the alarm should not be a surprise it should be more of a "duh" and irritation.
My personal take on the issue is if you rely on an alarm to keep you within a dive profile then you have done too many things wrong already. You should never hear an alarm during a dive and if you do the alarm should not be a surprise it should be more of a "duh" and irritation.