Hi folks,

I apologize fro relying on your charity for htis question -- I ought to
figure this out myself, but am so slow that I've run out of time.

I dhave a number of lecture slides writen in org-mode. Normally I simply
export to reveal.js using org-reveal. However, I now have to share these
notes with a co-instructor who uses markdown, but not org.  This is not
fatal; I can export to markdown mode and use pandoc to create the reveal.js
slideshows.

However, there are two small difficulties:

a) add a horizontal rule

pandoc expects a horizontal rule at each slide division.  So, if possible,
I would like to add an hhr element at the end of every headline.

b) speker notes

More importantly, org-reveal allows the use of speaker notes, thus:

#+BEGIN_NOTES

whatever I put here

#+ END_NOTES

is exported as:

<aside class="speaker-notes">
whaever I put here
</aside>

However, these blocks are ignored by the markdown exporter.

Presumably I need to add a filter, or build a very simple derived backend,
but my attempts thus far haven't been very successful.  I would really
appreciate some suggestions! Thank you,
matt