Manton has added automated transcripts of podcast episodes. Instructions are at Podcast transcripts - Podcasting - Help Center:

When you create a blog post that links to that MP3 with an audio tag (which on the web will do automatically for you), will associate the transcript with the blog post. By default, it will also include a link to the transcript from the published blog post.

Options to control this feature are available by installing the plug-in “Transcripts”. From the plug-in’s settings, you can disable transcription or disable the blog post transcript link.

There are additional instructions for those with Custom themes.