<div class="audio-player ">
    <iframe width="100%" height="300" scrolling="no" frameborder="no" allow="autoplay" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/85992360&color=%23ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&show_teaser=true&visual=true"></iframe>
</div>
{% if audio is not empty %}
<div class="audio-player {{ audio.variant }}">
  {{ audio.iframe }}
</div>
{% endif %}
{
  "audio": {
    "iframe": "<iframe width=\"100%\" height=\"300\" scrolling=\"no\" frameborder=\"no\" allow=\"autoplay\" src=\"https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/85992360&color=%23ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&show_teaser=true&visual=true\"></iframe>"
  }
}

Use this pattern to demo an embed of externally hosted audio.