[Koha] sounds in koha for holds

Does anyone use sounds in Koha for hold alerts when checking in items if that is even possible? If so what program event is used? We are using Firefox 3.6.3 and I have the add on Navigational Sounds 1.2.1. Any help would be greatly appreciated! -- Thanks, Lola McKee Tech Systems Specialist Salina Public Library 785-825-4624 Ext. 239