function start() {
  microm.startRecording().then(function() {
    console.log('recording...')
  }).catch(function() {
    console.log('error recording');
  });
}

function stop() {
  microm.stop().then(function(result) {
    mp3 = result;
    console.log(mp3.url, mp3.blob, mp3.buffer);

    play();
    download();
  });
}