badhouseplants-net/src/layouts/shortcodes/audio.html

<figure class="{{ .Get 1 }}">
  <audio controls preload="{{ .Get "preload" | default "metadata" }}">
  <source src="{{ .Get 0 }}" type="audio/mpeg">
  <figcaption>{{ .Get 0 }}</figcaption>
  </audio>
</figure>