Can you look in your data/media/1/# folder, where # is the profile ID, and verify that the sample audio track was created?
updated by @douglas: 03/07/14 05:33:18AM
You'll want to modify the profile_index.tpl, that is where you'll find the timeline/action code, and you should be able to use the variables {$profile_audio} and {$profile_video} since that is what you named them.