yes I do, but not when it is being echoed as part of the WP Audio PLayer.
at the moment I have it working perfect like this
<li>
<div>
<audio controls class="audio-player">
<source src="<?php echo $track; ?>" type="audio/mpeg">
Your browser does not support the audio element.
</audio>
</div>
</li>
using the HTML5 player