Well, if you want to pm me the apk I'll try it on my device and see if I hear anything.
Otherwise I would try compiling a dev app, and see if the same thing happens there. If so, take a look at your debug log and see if anything leaps out at you.
You could also try making a new project with a sprite that plays a sound when pressed, and try to export that.
On the dev app: I haven't had much luck previewing over wifi, so if you are trying to do that, be warned that your game logic probably won't run right. You want to export your game as cordova, un-minified, delete the config.xml file in the export folder, then zip the contents and put it on your mobile. Start dev app, go to documents, select your zip file, and press the 'Canvas+' button that pops up.
Good luck.