Assigning multiple audios to single button

How do you plan on updating the sequence for your model? You can use JS to update the audio source for a single audio widget based on which sequence is loaded. 

If you are using a select widget to pick the sequence, you could do something like this: 

$scope.checkSequence = function(){ 
 var sequenceValue= $scope.app.view['Home'].wdg['select-1']['value'];
 var sequenceList = $scope.app.view['Home'].wdg['select-1']['list'];


 for (i = 0; i < sequenceList.length; i++){
 var sequence = sequenceList[i].filename;
 if (sequence == sequenceValue){
 switch(i){
 case 0:
 $scope.view.wdg.sequenceAudio.audiosrc='app/resources/Uploaded/<your audio file>';
 break;
 case 1:
 $scope.view.wdg.sequenceAudio.audiosrc='app/resources/Uploaded/<your audio file>';
 break;
 case 2:
 $scope.view.wdg.sequenceAudio.audiosrc='app/resources/Uploaded/<your audio file>';
 break;
 default:
 console.log('in change audio');
 }
 }
 }
}

Call this function on the "Value Changed' Event for your 2D selector

If you want to use the same 'play' button that you're using to play the sequence, you can call a small function like the below on the button click event. 

$scope.playAudio = function(){
 twx.app.fn.triggerWidgetService('sequenceAudio', 'play');
}

For steps to set up the select widget see this community post: https://community.ptc.com/t5/Vuforia-Studio/Select-Widget-default-value/m-p/611653