debug.js

var tessel = require('tessel')
  , fs = require('fs')
  , ambient = require('ambient-attx4').use(tessel.port['A'])
  , audio = require('audio-vs1053b').use(tessel.port['D']);

var audioFile = fs.readFileSync('sample.mp3') // load mp3 into memory (small 29kb - 2.5 secs)
  , timeout = 1000 * 60 // how long to wait after trigger and actions have happened.
  , threshold = .2 // ambient noise trigger
  , queue = 2; // number of modules to wait for


ambient.on('ready', dequeue);
audio.on('ready', setVolume);


function watch () {
  console.log('ready and listening');

  var IntervalId = setInterval(function(){

    ambient.getSoundLevel( function(err, sdata) {
      console.log('getting sound level', sdata);
      if(err) return error(err);
      if(sdata >= threshold) {
        console.log('triggered');
        clearInterval(IntervalId);
        setTimeout(action, 1000); // tried adding timeout here... made no difference
      }
    });

  }, 1000);

}

function action (){
  console.log('playing audio');
  audio.play(audioFile, function(err){ // this sounds like crap... choppy small clips... never waited for it to complete. Minutes?
    console.log('done playing'); // script never gets to this line
    if(err) error(err);
    audio.stop(function(err){
      if(err) error(err);
      console.log('reseting audio');
      setTimeout(watch, timeout); // done handling trigger, go back to listening
    })
  });
}


function dequeue() {
  if(--queue <= 0) watch();
}


function setVolume(){
  console.log('adjusting volume');
  audio.setVolume(10, function(err){
    if(err) error(err);
    dequeue();
  })
}


function error(err){
  console.error("ERROR: ", err);
}