Just as you can add a video to your textivate resources, as explained here, or an image (see here), you can now add an audio file to a textivate resource so that students can listen to it as they complete the activities.
As with video and image embedding, there are 2 methods:
1. Via the "Extras" tab
Simply click on the Extras tab and type or paste the link to your audio in the "Audio url" box.