I have a D7 site running with Organic groups module, rules, panels, ... and a bootstrap sub-theme (js, jQuery update, ...) working in all browsers, ios and android, my customer needs to alert users with a beep sound when new OG content is created. I google arround and some answers are based on JS (only browsers), other by HTML5, and some by CSS using a wav file, all very confusing to me, I'll apreciate any help or directions how to handle it.