.play() crashes iPad

If I create a sound object and then try to play it, app immediately crashes. I need to set it's url in another eventListener but even if I specify a url directly it still crashes.

If I comment out the audio.play() line, no crash;

Ideas?? Pulling my hair out!! Thx!

// Play selected audio file
var audio = Ti.Media.createSound();
audio.url = 'files/audio/filename.mp3';
audio.preload = true;
 
var play = Titanium.UI.createButton({
    title:'Play',
    height:40,
    width:125,
    left:10,
    top:10
});
 
play.addEventListener('click', function()
{
    audio.play();
    Ti.API.info(audio.url); // can see it here
});

How long is the sound? Have you tried it with createAudioPlayer() instead? I recall that createSound() is intended for short sounds (like system sounds) while createAudioPlayer() is intended for longer sounds (like music).