I have a D7 site running with Organic groups, rules, VBO, panels, badges, private-message modules ... and a bootstrap sub-theme (js, jQuery update, ...) working in all browsers, ios & android, i need to alert users with a beep sound when new OG content is created (or any rules reaction). 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, like a custom module, preprocess function, js on tpl, ...? some code included will be very helpfull.